Hi, I would have to say neons all the way. But you also might want to do a nice school of harlequins in there. I seen a tank done with live plants, harlequins, 2 corys and it was just stunning.
Also the same bottom fellers and some neons both the regualr color and the black ones make a stunning display.
I just did a display with barbs, that is a whole different thing. I dont' really care for them now as they are more aggressive than I thought they would be. I will just leave well enough alone though, none of them are tearing fins but when these guys all expire I am going to do the neon and harlequin thing as my tank is a 25 gal.
I have a bristlenose for my algae, love them to bits. Best cleaners out there
Some other choices are:
Cherry Barbs - very small and cute and not aggressive at all
White Cloud Mountain Minnows - mine are going on 3 years now
good luck to you ....bugsy