"Wow, that's good to know. Kinda hate being restricted to mini ITX cases. Thanks!"
The case I linked to is what I built my recent living room machine in. It is very much the size of a normal audio receiver and laid out in a fantastic fashion. I give it a big thumbs up as a great value if it will fit where you want to put it. It takes a Micro ATX board, a full ATX power supply, and gives you the entire depth of the case for a video card install. I put that pretty small Zotac 660 there, but the much larger Gigabyte 660 would also fit just fine. The only thing that wouldn't fit is the GTX 680 that we have laying around work that I almost snagged before realizing it won't fit in any of my cases.
"there could be a chance in the future that I'd want to play one of the newer games and I simply want it to run smoothly"
I picked a $190 GTX 660 for each of my systems for a reason. They are both paired up with FX-8350s (8-core 4.0ghz) and I find them to be a great sweet-spot. Same memory bandwidth as the $70 more expensive 660 Ti, with 3/4 the GPU performance. Taking Tomb Raider as the current example, it put out a minimum of 50fps at Normal settings when paired up with my Phenom II X4 3.0ghz. Paired with the FX-8350 I dropped in last night it spits out a super-smooth 60fps with High shadows. Turning on the rather intensive TressFX fancy-hair it drops back down to 50fps.
The GTX 650 Ti Boost (note: the Boost version is very important!) is the same card with 4/5 the GPU power. Same memory bandwidth. With your current CPU you'd likely be hard pressed to find much of a difference between a 650Ti Boost, 660, 660Ti, 680, or Titan. You'll be very CPU bound, as I was on my X4 3.0. Drop an i5-3570 with new motherboard in to your system as the next upgrade, and you'll find some pretty nice differences. Anything $160 GTX 650 Ti Boost or higher though and you'll be able to get some very nice 50-60fps gaming, it's just a matter of how high you can crank up the settings. Moving from Low to Medium usually gives some very nice quality improvements. Moving from Medium to High tends to be much less pronounced.
Below the $160 price of a 650 Ti Boost you start to make some pretty heavy sacrifices in rendering. At half the price of a good Xbox though, $160 isn't an unreasonable price for PC gaming.