I would suggest going with the biggest you can afford. Bettas are typically able to withstand colder temps better than tropical fish. If you get a 12 gallon, you would also be able to regulate the temp better by adding a heater. (Not very expensive, they're worth it too). If you decide not to go with a heater, goldfish types are coldwater fish, although their tank can't be freezing either. Goldfish are also dirtier, so you would have to have less fish per gallon. For easy tropical fish, I would say the normal platys, mollies, swordtails, etc. I have gouramis too, I like them the best I think.It's up to you though.
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