ignore the "evga superclock". Just look at what gpu it is. The 680 is a far better gpu than the 580. For $100 difference, it's worth it.
Take the second rig with the following changes:
-680 instead of 580
-650W Corsair PSU. Even SLI 680s can fit on that PSU. 680 TDP = 195W. 3570k TDP = 77W. That's 272 Watts needed on the 12v rail. SLI is 467 Watts needed on the 12v rail. Anything higher than 650W is a waste of money in this generation of parts.
-Drop the sound card and ethernet card. Your mobo has quite good onboard ones already. If you are an audiophile, consider buying a high end sound card from somewhere else since that one isn't great.
-throw in an SSD as your primary drive. The 120GB ADATA one would work.
about the psu, it upgrades you to the 750W for free anyway.
Also, the 680 will delay shipping till around the 20th. The 7970 is an excellent option if you don't want to wait. The 580 is not a good option since it's overpriced atm.
looks good. The NZXT 6-port is ok if you want it, completely up to you.
It's actually not a bad build for a pre-built, it should play everything at max @ 1080p.
The SSD will vastly improve boot times. You should be able to fit a few programs on it too, just watch the space. Make sure all data (movies, etc) is on the HDD.
The protection on the i5 is only worth it if you plan on massive ocing... I'd drop it because that cooler won't be able to reach the safety limits anyway. But if you need it for peace of mind then it's fine.
Also make sure to get windows if you don't have a copy available already.
CoolerMaster HAF 922 Gaming Case
Cold Cathode Neon Light - Red
6 port NZXT Internal USB Expansion System
i5 3570k with protection
Asetek 550LC Liquid CPU Cooling with High Performance Push-Pull Airflow fan
8 GB DDR3-1600 Corsair Vengeance
670x EVGA SUperclocked 2GB
ASUS P8Z77-V LX MOBO
750W Corsair CMPSU 750TXV2
120 GB ADATA Primary Drive
2 GB Data Drive
Should I switch the motherboard to a ASRock Z77 Extreme4 for $41 extra or keep the ASUS P8Z77-V LX?
Another option is the ASRock Fatal1ty Z77 Peformance for $58.