Goodday Wzyz,
The buy or build question is usually not too difficult to answer because computer technology is one realm where the technology improves quickly and in a wonderful reversal of everything else the cost goes down. One other aspect of this beneficial trend is that computers also depreciate quickly. This means that buying used can afford higher quality and performance for less Kangarands.
Since your principal use is of the workstation variety, I would i recommend consideration of something like this >
http://www.ebay.com.au/itm/Dell-Precision-T5500-W5590-QC-3-33GHz-6-40GT-s-Intel-QPI-6GB-RAM-Dell-Warranty-/280954603402?pt=AU_comp_dekstop&hash=item416a33078a
> which is used Dell Precision T5500 with a Xeon W5590 3.33 / 3.6 quad core CPU, 6 GB RAM, and 2 HD's for $900 AU. To put that in perspective, a W5590 processor cost new $1,600 US by itself and I would expect this T5500 was in the $5,000+ range two or three years ago. Very high build quality- and of course, built specifically for the kind of programmes you're using, ability to use ECC error correcting RAM a very good RAID system, big power supply, and there is the option of expansion- two graphics cards, and up to 72GB (DDR3 1333) RAM.
The graphics card is generally of the poo variety so the thing would be to buy a new Quadro K2000 ($430 US), used Quadro 2000 ($250 US) or the best possible choice for your use, a Quadro 4000 off eBay US -about $300-350 US or a GeForce 660 GTX (2GB) for about $200AU. There are many advantages to a Xeon > ECC > Quadro for your work use including amazing reliability, 10 -bit color, extreme anti-aliasing, multiple light source modeling, much more refined shadows, gradients, and effects. You can use Special Quadro drivers that are optimized for Adobe graphics applications. The gaming qualities would not be astoundingly wonderful, but you also wouldn't have to shop, order, assemble, configure, and troubleshoot a built system..
In all, the used and improved Precision would cost as much as the new XPS, but with a focused capability of extremely high image quality. It's still a dilemma as the new Dell is new, the i7-3770 processing speed is very good, and with a better graphics card it would be better for gaming, there's a guarantee, and so on.
I tried a system using Partpicker AU with very similar components to yours and could not do a good one within your $1100 budget- but close >
PCPartPicker part list:
http://au.pcpartpicker.com/p/14zwN
Price breakdown by merchant: http://au.pcpartpicker.com/p/14zwN/by_merchant/
Benchmarks: http://au.pcpartpicker.com/p/14zwN/benchmarks/
CPU: Intel Core i5-4670 3.4GHz Quad-Core Processor ($249.00 @ PCCaseGear)
CPU Cooler: Thermaltake CLP0534 22.4 CFM CPU Cooler ($35.00 @ PCCaseGear)
Motherboard: Asus H87-PRO ATX LGA1150 Motherboard ($129.00 @ PCCaseGear)
Memory: Corsair 16GB (2 x 8GB) DDR3-1600 Memory ($139.00 @ Scorptec)
Storage: Samsung 840 Series 120GB 2.5" Solid State Disk ($99.00 @ Mwave Australia)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($95.00 @ Mwave Australia)
Video Card: Asus GeForce GTX 650 Ti 1GB Video Card ($149.00 @ Mwave Australia)
Case: Lian-Li PC-K58 ATX Mid Tower Case ($83.33 @ Mwave Australia)
Power Supply: Corsair Enthusiast 650W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($112.00 @ PCCaseGear)
Optical Drive: LG GH24NS95 DVD/CD Writer ($21.00 @ Mwave Australia)
Operating System: Microsoft Windows 7 Professional SP1 (OEM) (32-bit) ($149.00 @ PCCaseGear)
Total: $1260.33
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-06-09 23:13 EST+1000)
Probably a good performer. Remember that as compare to the Xeon, i7's, i5 CPU's do
not have hyperthreading- which is considered as a near doubling of the cores' calculation capacity- a virtual 8-core. improves speed by working on calculation using idle core time. This means i5's are not extremely fast in effects processing or rendering.
Building a system is not terribly difficult- only be very patient and take your time on the first one- and in my view boosts greatly understanding of the parts that assist when something goes wonky.
A system closer to your budget could be done > the SSD OS/ applications drive could be deleted (-$100 AU)- and added later, there is probably a case in the $50 AU range (-$30) and with a wider choice perhaps about $30 could be saved on the Power supply. The I5 CPU comes with a CPU cooler that might be adequate- (-$35) I would use, given the choice, a Seasonic in the 550W range- so with care in price hunting possibly $1150 AU with the keyboard and mouse.
Good on ya mate,
BambiBoom
[ Dell Precision T5400 > 2X Xeon X5460 quad core @ 3.16GHz, 16 GB ECC , Quadro FX 4800 (1.5GB), WD RE4 / Segt Barcd 500GB] ( Total cost about $1,100 US) > Windows 7 Ult > AutoCad, Revit, Solidworks, Sketchup, Adobe CS MC, Corel Technical Designer, WP Office, MS Office ]
PS> For entertainment value and because it's easy to copy and paste, here is the system I would build to replace the one listed above with a generous but not stupidly unreal budget >
The BambiBoom Pixeldozer Espresso TurboKlonk 3000 CAD / Imaging / Rendering / Editing Workstation ® © ™ ℞ _5.31.13
1. Xeon E5-1650 6-core 3.2 /3.8GHz $600
http://ark.intel.com/products/64601
2. ASUS P9X79 WS LGA 2011 Intel X79 SATA 6Gb/s USB 3.0 SSI CEB $380
3. Kingston 32B (4X 8GB) 240-Pin DDR3 SDRAM DDR3 1600 ECC Unbuffered Server Memory w/TS Intel Model KVR16E11/8I $300.
4. NVIDIA Quadro K4000 3GB GDDR5 PCI Express 2.0 x16 Workstation Video Card $800
5. SAMSUNG 840 Pro Series MZ-7PD256BW 2.5" 256GB SATA III MLC Internal Solid State Drive (SSD) $250
6. 2X WESTERN DIGITAL 1TB HARD DRIVE SATA 64MB 6 Gb/s WD AV-GP $170
7. LIAN LI PC-A75 Black Aluminum ATX Full Tower Computer Case $182
8. SeaSonic X750 Gold 750W ATX12V V2.3/EPS 12V V2.91 SLI Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply $150
9. Microsoft Windows 7 Ultimate SP1 64-bit - OEM $190
10. Noctua NH-D14 120mm & 140mm SSO CPU Cooler $84.
11. ASUS Black Blu-ray Burner SATA BW-12B1ST/BLK/G/AS $85
TOTAL > about $3,200
And today I would buy a 27" 2560 X 1440 monitor (probably Samsung) and 24" dual monitor configuration