You could get some nice Cryptocoryne (cheap, all kinds of variations), some Echinodorus (little more expensive, but NICE), some bunched plants for low light e.g.Limnophila sessiliflora (cheap, too).
You can buy these at www.aquariumplants.com
. They have excellent customer service there, great quality and good prices. Don't buy from www.aquaticplantdepot.com
. They are absoloute %#@%! I had one order from them, that was worse than someone can imagine and it took me forever to get my money back!
Some people here in the forum also like www.azgardens.com
. Personally I have never ordered there, so I can say nothing to it.