Approximate Purchase Date: Today or this weekend at the latest
Budget Range: $1500-$1600 after rebates
System Usage from Most to Least Important: Lots of Gaming(GW2,WOW,BF3, League of Legends, Black Ops 2), internet surfing, movie watching
Are you buying a monitor: Yes
Parts to Upgrade: All
Do you need to buy OS: No
Preferred Website(s) for Parts: Newegg, Amazon, NZXT, Microcenter, BestBuy, Fry's
Location: Pasadena, California
Parts Preferences: None
SLI or Crossfire: Maybe later on
Your Monitor Resolution: 1920x1080
I have done a lot of research and have been looking at these boards like a mad man.
Additional Comments: I have tried really hard to make the best bang for my buck comp, but stacking these forums everyday and trying to learn from you guys/girls. I would like to know if these parts are all compatible together, and any deals you know of would be awesome.
And Most Importantly, Why Are You Upgrading: I want to play PC games on ultra settings with friends, and not have to worry about upgrading for awhile
This looks like a pretty sweet rig so far. Like obsama1 said, compare the P8Z77 V to the Extreme6, not the 4. Also, look at the MSI Z77A-GD65. It received the best rating in a review by Tom's Hardware comparing 6 motherboards in that price range, along with the Extreme 6. I would say go with either the Ext6 or the GD65. Either will work.
As for the GPU, the 670 and 7970 really comes down to the specific model (overclocked vs non-overclocked) and game. The 670 will will in some games, the 7970 will win in others. I would say the 670, just because I'm kind of an Nvidia fanboy in the higher-end section. I think the 7970 is actually a bit faster overall though. Either will serve you well, however, I would just go with what's cheaper.
You might also want to consider getting a fully-modular PSU like the AX750. It's much easier to manage cables with a fully-modular PSU. You'll thank me later.