You should plan on having at least one fan (front) for intake, one fan (rear) for exhausting heat, in the case. If it doesn't come with at least that for fans, get ones to install where they are missing. If you want to do more to keep it cool, put an Arctic Cooling GPU cooler on whatever video card you get.
BTW, the AC unit has two benefits...
1. It will keep your card running cooler at stock cooler noise levels
2. It will keep your card as cool as the stock cooler while being silent.
I put one onto my 6800GT and it is both quieter than stock, AND cooler at the same time. The one for the 6800GT doesn't have the speed switch that the one for the 9800 card did (that I had) but that's fine with me. My main source of sound/noise inside my case is the fan on my processor heatsink.