To buy a new PC or Wait?

I have decided to change my old rig after long thinking but the question is to buy a new one now or to wait until Nvidia releases the 800 series(Maxwell) GPUs since i am interested in overclocking and the Maxwell GPUs have very low TDP
note : If i bought a new rig now i ma not going to upgrade it except after two years
 
Solution
Check the options in this list. I've assumed that you would be using your current keyboard, mouse, Windows, HDD (SSD added)

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor ($304.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: Asus Z87-PRO ATX LGA1150 Motherboard ($164.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($79.99 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk ($82.95 @ Amazon)
Video Card: EVGA GeForce GTX 780 3GB Video...
No matter how long you wait, Technology will always be a step ahead of you. You can upgrade now and be safe for a couple of years, or upgrade later and start the clock then. Granted yes with the GTX 800 series just around the corner, it's only a matter of time~ Good luck!
 
It would depend on your preference in terms of what new component is more important for you. GPU, CPU, mobo, RAM etc. Here are some new techs expected in 2014:

Maxwell series GPU line from nVIDIA (First Maxwell card has been launched GTX 750, GTX 750 Ti)
DDR4 in RAM

Tech is very rapidly changing and your new build could soon be outdated with further advancement. We just can't keep up with it. So better work out your priorities and go for it otherwise you'll continue to wait :)
 
800 series is coming out in a month or two, but will likely be a staggered release of lower end devices first, and higher end equipment selling next, and then the middle slowly filling in throughout the year.

However, the rest of the PC space is not expecting much in the way of upgrades... so why not build your rig, transfer your current card over as a stop-gap, and then when the 800 card you want is released then jump all over it.
 


Any parts reusable? Will you need keys, mice, monitor, case, OS, etc?

If this is strictly for gaming then you can build yourself a very nice i5K system, high end motherboard, 16GB of DDR3 (2x8GB), a nice fat SSD for OS and programs, and HDD for media, and still have $500 left over for a high end GPU.
 
Check the options in this list. I've assumed that you would be using your current keyboard, mouse, Windows, HDD (SSD added)

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor ($304.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: Asus Z87-PRO ATX LGA1150 Motherboard ($164.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($79.99 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk ($82.95 @ Amazon)
Video Card: EVGA GeForce GTX 780 3GB Video Card ($489.99 @ NCIX US)
Case: Cooler Master HAF 912 ATX Mid Tower Case ($49.99 @ Newegg)
Power Supply: Corsair CSM 750W 80+ Gold Certified Semi-Modular ATX Power Supply ($99.99 @ Microcenter)
Total: $1302.87
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-20 23:20 EST-0500)

This is well within your budget range. If you opt for i5 then further savings can be met.
 
Solution
CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor ($304.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: Asus Z87-PRO ATX LGA1150 Motherboard ($164.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1866 Memory ($89.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($64.99 @ Newegg)
Video Card: EVGA GeForce GTX 780 3GB Video Card ($489.99 @ NCIX US)
Case: NZXT Phantom 410 (Black/Orange) ATX Mid Tower Case ($109.98 @ Newegg)
Power Supply: SeaSonic 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($156.66 @ Newegg)
Optical Drive: Asus BW-16D1HT Blu-Ray/DVD/CD Writer ($79.99 @ Newegg)
Total: $1481.56
 

I will reuse screnn and speakers
 
PC component price/performance is getting better constantly.
If you wait for the next best thing, you will wait forever.
If you have a need today, buy today.

Yes, Maxwell is coming, but starting at the lower end. Top end cards will not be here until the end of the year.
If they truly are outstanding performers, their price will be at a premium.
Your budget will buy you a very competent new pc.

Post a prospective build with links to where you might buy.

In principle, spend(for a gaming system) 2x your cpu budget for your graphics card. It is that important.
For example, pair a i5-4670K @225 with a $500 GTX780.
The i7-4770K chips are slightly better, but not worth the $100 price premium.
Few games can use the i7 hyperthreads.

I will not build today without a SSD for the "C" drive. 120gb at least, 240gb is preferable.
Use your old hard drive for storage of large files such as video's.
Anything faster for a cpu is pointless, A GTX780 is as good as it gets with a single monitor.
If you are planning on triple monitor gaming, or a 4k monitor, then things get much more expensive.

Buy only a quality psu.
Here is a list for guidance:
http://www.eggxpert.com/forums/thread/323050.aspx
You will need 575w for a GTX780. I like to overprovision a bit, say to 650w or so.