It really depends on the size of your aquarium. How large is your tank? If it's less than 15g, then probably mosses, anubias, and java fern are probably your best bet. If you tank is 15g or larger, then you can get away with quite a few more plants. There is a list of easier to keep plants in my signature, just click on that. George posted an extensive list I made a while back. Consider adding rootabs to the substrate. They are inexpensive, and work very well for 3-4 months before they need to be replaced. Any plant that feeds via its roots will benefit. Low-light aquariums can be some of the prettiest out there, IMO
llj