The air also rises out through the expansion slots, and there's grills and stuff at the top. A user on OC3D or Hardforum, I forget which, tried changing the 120mm fan, and also adding another fan behind the expansion slots (he had to remove the shroud on top of the case) and it made no difference at all to temps. The cases bring in cool air from the bottom, and all the hot air in the case rises out the top. You don't need much exhaust because the 180mm fans are creating a vertical wind tunnel.
RV02 is aimed more at the gaming crowd. It's a fair bit cheaper, a little noisier, FT02 is aimed more at the enthusiast. It's quite expensive (not Lian Li expensive though), and quieter. It has 7 expansion slots, where as the RV02 has 8, which is made to cater for triple or quad GPU setups. I think it has less HDD bays though.
I'm getting the FT02 myself because it's aesthetically more pleasing to me, although I'm waiting to see how long the enthusiast 69xx series cards will be, since both cases only just manage to fit a 5970 in, before committing. The midrange 68xx series all fit, obviously.
