ok...reading through this is making me sick, honestly.....you want to flush your current fish, or put them in a 5 gallon tank where they will be absolutely miserable, because you are bored with them....you dont want guppies because they reproduce so fast, yet you want a tank full of livebearers which WILL reproduce and you'll most likely end up killing all of their fry because you dont want them....your two favorite choices are mollies and swordtails which are both too large for a 10 gallon tank, not to mention mollies should have some salt....
the only advice i would give to you is to give your current fish to the pet store and actually THINK about what you want this time so you arent flusing fry (and full-grown fish) by the hundreds......maybe leave the tank empty for a month and see if you still want to keep fish then....you are right, the world does not need more guppies, nor does it need more platies, swords, mollies, endlers, or fish abusers...
EDIT: yes it was blunt, and I'm sorry that I may offend, but c'mon - he/she even has a thing about embracing Jesus in their sig, and are speaking of killing living creatures in an extremely inhumane way because they're boring