Be careful what plants you buy from the lfs. I see a lot of bog plants being sold as aquatic plants. They will last for a month or so underwater, but will eventually die.
As long as you have fluorescent lighting, you can grow some of the lower light tolerant plants. As mentioned previously, java ferns are great for low light, as are anubias. Amazon swords would not be a bad choice although I have found that mine stay rather small under low light conditions. I have had excellent luck with contortion val and italitan val as well.
What is your current light setup, number of bulbs, type, size, wattage, etc? And what is the size and depth of your tank? Armed with that info, we could probably give you some better advice.