This thread (http://www.plantedtank.net/forums/sh...ad.php?t=56042
) provides a list of low-light plants that are great for low-tech set-ups.
Off the top of my head, the ones I've had the least trouble finding at my LFS are usually Java Fern, Java Moss and various Crypts. TopFin (PetSmart brand?) sells a lot of these as snail-free cultured plants, including Bacopa Caroliniana, which can be a nice back ground plant. Some of them can get pretty big though, so make sure you check up on the sizes before purchasing
And good luck! I'd love to see pictures when it's all set up!