Here is a bundle currently being offered on the same site. The 8 core cpu, a motherboard, and 8gb of ram for 350$.
http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=8688689&csid=_22
To me, that looks like a nice place to start. I guess my only question, and I don't know if it's even relevant, is would the Nvidia 770 4gb card be compatible with that board?
The motherboards is
garbage. Multiple reasons behind this, but it's a very bad place to start.
Also, you've stated you want to go with the GTX 760 or 770. You've also said it's important to be able to future-proof the build.
For this reason, your starting point is to get a highly rated
SLI motherboard. You want to make sure the 2 16x PCIe lanes are on separate busses. It's vital.
If you've made the decision to stay with AMD, then a much better (albeit not what I would call ideal) motherboard would be the Gigabyte GA-990FXA-UD3. It supports 2-way SLI (almost all boards that are not nForce support CrossFire btw). I also think it's ports are on different busses, but make sure first. (I think it's a requirement of SLI, but I'm not sure).
Go with DDR3 1866 RAM in this instance as you'll likely want to run in a quad-channel (4x2 or 4x4) configuration.. Also, if you'll be playing at 1920x1080, or even 2560×1600, you don't need a 4GB gfx card. Those cards only start to show their value in high resolution triple monitor setups or at 4k (who's playing at 4k?).
With the given specs, you could likely buy 2x2GB GTX 770's, SLI them with you 8350, overclock the entire rig (5ghz on the CPU), and have one of the fastest gaming rigs for ~$1,200.
CPU: AMD FX-8350 (again, if you want AMD)
Mobo: Gigabyte GA-990FXA-UD3
RAM: G.Skill (2x4GB) 8GB DDR3 1866 (you'll buy another set later)
GPU: 2x Nvidia GTX 770 GTX 2GB cards (try to buy superclocked, and sort through)
PSU: SeaSonic X Series X-850W
HDD: Who gives a shit, but hybrid SSD would be okay.
Case: Whatever, something big.. I don't look at cases, they are unimportant if everything fits and it's quiet. For a TV based rig, it should be out-of-sight, and QUIET.. so what it looks like is again, unimportant.
There's a kick-ass AMD gaming rig with SLI out of the gate.. Fuck "later." It will take anything you throw at it.. The only way to make it better would be to add another set of the 8GB kit RAM, and to swap out the CPU/Mobo for the Intel counterpart; but you'd be adding almost $300-400 for not much performance gain (few FPS) in your gaming experience.
This build should be around $1,300, I think, I haven't bothered to add it up.. But that's what I'd do if I couldn't go balls to the wall with the high-end Intel build.. It'll also let you overclock the SHIT out of your setup.