My tank is a 5 gallon. Cadlights sells them on their website, they also have a lighting upgrade to 4 bulbs, but i think the 2 is fine. I've had the tank running for about 6 months with basically no mods, and its doing great.
My apt stays pretty cool, but if it gets out of control then i will get one of those nano chillers. The open top does a nice job of dissipating heat, but causes a lot of evaporation.