Actually, multiple tanks may be the way you want to go. Since be having such a large community with the various peaceful fish you like ... starts ruling out some of the more robust/semi-aggressive fish that you want also.
It's just that I like really big tanks. When I get old enough to actually have my own tank (my mom won't let me) and when I get enough moey, I probably will have lots of smaller (30-40 gallon) tanks. I have another question, too. Would RTS's be okay on thier own, with no other fish in the tank? How big of a tank would they need?