I have no issues at all with my main system (3930k box) I am in the process of putting together a decent spare so i can box when im at work. Here is what i have so far

i5 2500k
16gb kingston hyperX ram
asrock extreme4 p67
thermalright u120ex HSF
enermax galaxy 1250w psu (overkill i know, but i had as a spare for my main will get a 600w or so at some point)

My main question is in the GFX card, Im looking at either the GTX 560Ti 1gb, 560ti 2gb, or the 560ti 448core 1.2gb I would concider an ATI card, I'm sure they are great, i'm jst used to NVidia snice i've used them for years, i tried ati back when the 4870x2 was new and had a bad experience with it. Any input you guys could give me would be greatly appreciated. If you have reasons over opinions, or even some hands on experience with the 560's let me know, i haven't used any of them. all i know for sure is that the 560ti is on the gf114 die using all cores, and the 448core edition is a gf110 (570&580 die with some cores disabled)

Thanks again