maybe something along these lines, note I didn't include a GPU as I'm unsure if CAD and other 3D type programs really prefer those special quadro/firepro cards or not. So you'll have to ask around about that. But in general I think a good base for you to have is an i7 either Skylake or Haswell and 32 gigs of RAM, if you are truly serious and don't mind investing in your work tools.
[PCPartPicker part list](http://pcpartpicker.com/p/fmGYMp) / [Price breakdown by merchant](http://pcpartpicker.com/p/fmGYMp/by_merchant/)
Type|Item|Price
:----|:----|:----
**CPU** | [Intel Core i7-6700K 4.0GHz Quad-Core Processor](http://pcpartpicker.com/part/intel-cpu-bx80662i76700k) | $413.90 @ Amazon
**CPU Cooler** | [Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler](http://pcpartpicker.com/part/cooler-master-cpu-cooler-rr212e20pkr2) | $24.88 @ OutletPC
**Motherboard** | [Asus Z170-A ATX LGA1151 Motherboard](http://pcpartpicker.com/part/asus-motherboard-z170a) | $153.99 @ SuperBiiz
**Memory** | [G.Skill Ripjaws V Series 32GB (2 x 16GB) DDR4-2400 Memory](http://pcpartpicker.com/part/gskill-memory-f42400c14d32gvk) | $199.99 @ Newegg
**Storage** | [Samsung 850 Pro Series 512GB 2.5" Solid State Drive](http://pcpartpicker.com/part/samsung-internal-hard-drive-mz7ke512bw) | $213.43 @ Amazon
**Storage** | [Western Digital Blue 2TB 3.5" 5400RPM Internal Hard Drive](http://pcpartpicker.com/part/western-digital-internal-hard-drive-wd20ezrz) | $75.99 @ SuperBiiz
**Power Supply** | [SeaSonic 650W 80+ Gold Certified Fully-Modular ATX Power Supply](http://pcpartpicker.com/part/seasonic-power-supply-ss650km) | $115.98 @ Newegg
**Operating System** | [Microsoft Windows 10 Pro OEM (64-bit)](http://pcpartpicker.com/part/microsoft-os-fqc08930) | $130.29 @ B&H
| *Prices include shipping, taxes, rebates, and discounts* |
| Total (before mail-in rebates) | $1338.45
| Mail-in rebates | -$10.00
| **Total** | **$1328.45**
| Generated by [PCPartPicker](http://pcpartpicker.com) 2016-01-18 13:49 EST-0500 |