I've had Neons, guppies and Mollies. The only one that interested me was the guppies as one of them was absolutely awesome! I think I want something a bit different if you know what I mean?
1 word of advice don't go for tiger barbs unless that's what u want as you are quite restricted with what u can put in there. I bought tiger barbs and red eye tetras without doing my research (silly me I know) and I can't put anything in there with long fins etc my red eyes wiped out my 5 guppys within 2 days when I first got them