Darts are super fragile (but hardy) but require lots of floor space for territory. And those dart setups can be pretty expensive and a pain to set up. If youve had frogs before, go with darts. If this is your first frog, a pair of red eyes would be a great start. Is your tank vertical or horizontal. Its not like they think theyre 100 feet up in a tree or anything, it just helps situate plants, etc.
Check out saurian.net, blackjungle.com, and sweetarrowreptiles.com if you still want darts. Sandfiredragonranch.com can hook you up with some sweet CB red eyes and there are several red eye morphs availiable on the kingsnake.com classifieds, such as albino, xanthic, and melanistic.
Have fun whatever you choose!