PSU:
Before you put off that 850W power supply:
http://www.hardwaresecrets.com/article/OCZ-Z-Series-850-W-Power-Supply-Review/946/10If it's a good buy at $170, it's a fucking steal at $60. It's overkill. It's beastly. It doesn't overclock superbly (930W max). It's quality. Get that before it runs out. Also, it's not just 80% efficient: It's 87+% efficient at all levels.
CPU:
Processor is meh. If you plan on overclocking, get a:
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103808Note that this one is much better than the one you shouldn't get:
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103674The reason is because of stepping.
If you don't plan on overclocking, then stick with the $117 OEM version, but know you'll have to get an OEM heat sink.
Otherwise, it's better to get an i5 750 with ddr3.
Motherboard:
I've become convinced that there is no reason to get an ATX motherboard unless you want a lot of expansion slots or a lot of peripherals. The north/southbridge are the same on an ATX as a µATX, which typically means overclocking is identical. The effect motherboards have on overclocking seems to be minimal as well. The only problem I have with that motherboard is the ddr2. Unless you have a good reason to get ddr2, you should be getting an am3.
This looks straight up awesome for the price:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130275There's quite a few more, like any of
these. I've been extremely happy with my gigabyte boards, and less than happy with my DFI board (lack of support--I can't run an am2+ or am3 processor on my am2 board even though Asus am2 boards can).
RAM:
Poor, poor choice. If you have to get ddr2, get ddr2-800 @ CL 4. Otherwise get any DDR3.
GFX:
meh. The 5770 is a 5770. I don't think there's enough differences in graphics cards to justify buying by brands. If you can, get a 5850. Lord knows you can power it (or a 480) with an 850W PSU.
HDD:
spinpoint f3 or caviar black.
Case:
Up to you really. I've given my rant on cases too many times. Suffice it to say, the end result doesn't matter. If you go cheap, you get a cheap case. If you go expensive, you'll never need/want a new case through all your builds.
"Parliamentary inquiry, Mr. Chairman - do we have to call the Gentleman a gentleman if he's not one?"