Damn, that sucks. Actually had the same thing happen (opposite, though--heater failed, fish froze) many years ago. Thankfully it was the GF's fish, and my tank was fine, but still a bummer.
Consider this a fine opportunity to go in a different direction. Once you get something established, you're married to it for at least a decade, and even then it can be hard to change directions. The first thing you need to decide is if you want to keep up the community thing, do a species tank, or a biotrope tank? I think biotrope tanks are badass, myself. Species tanks can be fun, as well. Figure out the direction you want to go in, and then you can figure out the specifics.