Some ideas can be linked off of some of the links to PSUs here. A 650ti Boost takes more wattage than the 750ti. I've been explicitly telling you this stuff because this little bricks will show their peak, not continuous wattage. I'm telling you this because I don't want to see you blow up your PSU, or worse your machine due to piecing the wrong things together. The case is easy, it's that brick idea you want to do. You have to go with something like the 750ti OR a 970 when it comes out because those are the most powerful low wattage cards on the market due to their architecture. A 66w 750ti and a 50w i5 4440 is perfectly feasible on the 192w brick on the 160w power interface Joe linked. A 100w+ card plus a 50-60w i5 isn't for continuous gaming with demanding games.
Have you taken a look at those cases that can be mounted to the VESA mount on monitors? Those are pretty small. You could also try modding a console case. Your options are pretty high if you modify or use a premade brick setup. Just keep your component watt usage in check.