It looks to me like the ultra microfly case uses a micro-ATX motherboard, not a ATX. That will limit you to a single fast vga card, not sli or crossfire. That's not a bad thing with some strong cards about to launch. The vga card will be the biggest heat producer in your system, not the CPU. If the card has a good cooler, particularly if it exhausts the hot vga air directly out the back, then there should be no problem with most cases. If you have a 120mm intake fan in front, and a 120mm exhaust fan in back, then heat can be controlled. You may have to pay a price with increased noise if you need fast turning fans. Liquid cooling gets the heat away from the generating source efficiently, but the heat exchanger and it's fan will have to take up space and noise somewhere.
If your gaming needs are moderate, a 8800GTS-512(G92) and a E8400 should work fine.
If you want a stronger system, look at the Antec mini P180.
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129041 It should hold anything you need in a relatively small, well cooled box.
Wait a bit and look at the new launches from Nvidia and ATI.
I think you will have to make some compromises on quietness, portability, and gaming power.