Though I don't agree with the no heater idea lets keep this friendly. If he chooses to not run a heater and he says to go without a heater he is no more stupid than anyone else who says go with a heater.
Heaters can fail, either fail by staying on which is the worse, or fail by never coming back on. In the BRS videos they replace their heaters every year to make sure nothing bad happens.
Back to the question. You will get a wide range of people who say which are the best but hopefully you will see about three or four companies that pop out from your question and from others asking about heaters. I use Cobalt Neo-Therm.
I've always used a heater. I actually had really bad luck with the Cobalt Neo Therm blowing up in my tank and killing a lot of fish and coral. The company was also really horrible to deal with. I will never purchase anything from them again. With that said, I run two heaters on a controller and switched to Jäger.
