This is my second build, but I decided not to reuse that many parts. I already had the mouse, keyboard, harddrives, wireless card, cooler, monitors, and OS. I came from an i7-950, Gigabyte x58a-ud3r, and a HD6850 (parts for sale for the right price) and decided I wanted some more gaming power. Plus I just really enjoy building and screwing around with parts inside my case.
Actual Price Breakdown (I just picked things up as they went on sale): i5-3570K: $180.19 MSI Z77A-GD65: $91.59 (after rebates and microcenter combo) Crucial Ballistix 16GB: $84.79 Gigabyte HD7950: $329.79 Fractal Design Define R4: $95.39 SeaSonic 850W: $109.99
So far everything runs great. I had to deal with a fair bit of GPU droop when I installed the card, but some updated cable routing allowed me even it out mostly.
I'm running a fairly basic overclock, just giving what the motherboard gave me for memory and CPU, but I pushed the GPU another 10% on both clocks. I knocked off 1 star for the GPU because the voltage is locked and I have yet to find anyone who has successfully gotten around this wall.
I know the power supply was overkill but Newegg had a pretty awesome deal and I'm debating eventually going for a crossfire (once AMD figures out their ****).
Overall I'm pretty happy with everything and I have just been chugging away at Bioshock since I got everything built up.
Lastly, I just want to say how amazing Microcenter is. I purchased everything for this upgrade from them except for the PSU and mostly because their customer service is so awesome. Since I purchased the parts both the price of the RAM and the CPU fell and I was able to get the price guarantee reimbursement with no trouble at all. Not to mention they really seem to know their stuff, I can't tell you how much time I wasted the day I bought the parts just shooting the **** with the guy as I tried to make up my mind.