I do know about the horrid things that could happen if you don't quarantine. Such bad stuff. 0.0
Thanks for all your input! :D I will be looking at 20 gallon longs, since my dresser/desk isn't too wide. The 10 gallon fits fine, but a 20 gallon may be a bit too much on it.
I think 15 would be good for me, but I wouldn't be able to get them all at the same time since lack of QT space. Would maybe 3 at a time each time I add new girls suffice? That's normally the number of girls I like at my fish stores :)