I contacted a local company to build a rig for me. I have 3 large monitors, and I do 3d rendering, work with very large photoshop documents, and multi task like a mofo. Here's the build and price they came back with:
CUSTOM BUILD MID TOWER = $1649.99 + taxes PARTS
$65 Labor to make Ghost Image and test then install customers sata drive (1TB)
1 Year fact. Wart. Parts & Labor 100% - (hardware only) Extended up to 5 year if want.
12GB of ram is a lot, but the memory intensive programs you use may benefit from it. Check how much memory your current system is using in the task manager.
I would at least ask for a better case and power supply. Trusting a $20 OEM power supply with more than $1500 in computer components is a huge mistake. I also think something that expensive should look and feel the part (Lian Li or at least Antec quality construction).
The one year warranty doesn't really mean much, just that they will handle the return for you; all of the components come with manufacturer warranties.
Here's what those components would cost from Newegg (slightly upgraded in places):
Intel i7-950 (Slightly better for overclocking than an i7-930, only $15 more now)
EVGA X58 FTW3 132-GT-E768-KR LGA 1366 SATA 6Gb/s USB 3.0 ATX Intel Motherboard (2x SATA 6Gb/s, 6x SATA 3Gb/s) $508 with promo code MBTEN92
Wow, thanks for the awesome reply. So I guess my next question is, is $560 a reasonable price to pay for labor? I have put together computers in the past and it's not hard and doesn't take that long -- I'd imagine that's doubly true for a place set up specifically to do it. It's probably like 3 or 4 hours of labor, right? Or am I off base and paying a third of the price in labor is reasonable?
I don't think it's reasonable, and that's what I was getting at. I would be surprised if it's even 3 hours of labor for an experienced builder (~1 hour to install components, ~1/2 hour to set up windows).