If avoiding overkill is good, value should also be a priority. In that case, you should be looking at something more like this:
Intel Core i7-920 Bloomfield 2.66GHz 4 x 256KB L2 Cache 8MB L3 Cache LGA 1366 130W Quad-Core Processor - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Don't pay almost $300 more for the 950, it's only clocked 400MHz faster. You already mentioned overclocking as a possibility, and the 920 is known to OC beyond 4.0GHz, which I doubt you'll even need.
$289
GIGABYTE GA-X58A-UD3R LGA 1366 Intel X58 SATA 6Gb/s USB 3.0 ATX Intel Motherboard - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Good brand, USB 3.0 and SATA III, option for CrossFire.
$210
ATI 100-505553 FirePro V5700 512MB PCI Express 2.0 x16 Workstation Video Card - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Up to you. I don't know much about workstation cards.
$325
2x OCZ Gold 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Low Voltage Desktop Memory Model OCZ3G1600LV6GK - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
2 sets - 12GB for rendering/modeling.
2x $160 - 20 MIR
SAMSUNG Spinpoint F3EG HD203WI 2TB SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
F3s are much better drives, but the 1TB is out of stock (Seagate's 7200.12 1TB is good too at ~$90. Both are better than that WD).
$180
Dell UltraSharp U2410 Widescreen LCD Monitor 24" - 1920 x 1200 @ 60 Hz - 16:10 - 6 ms - 0.270 mm - 1000:1
http://www.compsource.com/ttechnote.asp?part_no=4647346...
Nice H-IPS monitor. So you can see what you're doing.
$528
CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Don't skimp on the PSU. Quality PSUs are worth the money. 750W in case you want to add in another card in the future.
$120 - 20 MIR
COOLER MASTER Hyper 212 Plus Intel Core i5 & Intel Core i7 compatible RR-B10-212P-G1 120mm "heatpipe direct contact" Long life sleeve CPU Cooler - Retail
http://www.amazon.com/Cooler-Master-RR-B10-212P-G1-Univ...
For overclocking.
$30
Total: $2002 before rebates, $1964 after. All free shipping too.
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Take out one $160 set of RAM and you're at your $1800 build, both price- and specs-wise, but with a much better monitor, HDD, and PSU.
You have room to use a better graphics card or add a second; I'm not sure what you need. Grab some AS5 if you need to OC past ~3.6GHz. You have a case already?
You can shave off a few dollars by getting a less expensive monitor, the 1TB F3 (if it's in stock), and/or less RAM. I don't recommend getting less RAM though.
550W should be enough for the build you listed, but it's always a good idea to be ready for any future upgrades.