Sorry but i did not read the last part Some times i assume to many things and its wrong! Get the 590 if you can't get the 7970! Also a 2500K is the cpu i would buy not a 2600K unless i was doing more then gaming. Sorry!
1) i've heard that an i5 2550K is also a good cpu
3) you can also SLI GTX 560 Ti, better performance and more stable than a single 580
5) my experience is that with a sound card you get a little more fps and its more stable when you gonna overclock your cpu
i5 2599K, and get the msi gtx560ti twin frozr II/OC 2gb x2 and do 2-way sli on them if you can't get hd 7970, no need sound card,
cooler master hyper 212 EVO is a better choice, go get any 6400/6500 DPI (depends on whether you are a palm type, claw or finger tip type mouse user) look at how you hold your mouse and base it on the size of the mouse, (just made up the name) but you can see something about that in youtube, look up ncix, that should help you get some idea.
i would choose the msi z68A-gd80 (G3)(Gen 3) if you can get it over asus but thats just me, but with the msi z68a-gd65 (b3) or better but i believe the asus mobo is good, oh btw the msi z68a-gd80 (G3) has a good deal on newegg for around 180 bucks or so after rebate
AMD 7970 is no doubt the best gpu but i could find anything on 3D..like nvidia has. Also as per my thinking 3D gaming with nvidia glasses must be better than compared to stock others that comes with monitors.
I have never used a ati gpu. Also driver support in amd is not as good as compared to nvidia(i might be wrong also).
SLI is something I'm pretty confused after reading about micro stuttering. i play to play on 27'' 3D monitior at 1080p.
I personally like the gigabyte z68 ud4. Can anyone explain me how asus is better than gigabyte. Also i read lot of RMA issues about ASUS.
AMD is available at my place but somehow i am a green boy fan. It does offer better performance per watt..but how about i buy a nvidia an then sell it when the kepler gpu somes and get a new one like gtx 680?