First of all, I have to say this is all up to you and what you are capable of taking care of. Live plants are great, but remember some have light, ph, temperature, and other requirements to thrive. Also, please do not just buy plants at the aquarium store, research first. Most plants sold in the stores are not totally aquatic and will not thrive, die, and pollute up your tank. If you stay on top of things, plants are wonderful! I would suggest Vallisneria and some aquatic mosses, tied to ornaments for a lovely affect. If you want more information on plants i suggest this link
http://www.plantedtank.net/ for they have a great little aquatic plant database. Know what you are buying and plan out your aquascape before you buy your live plants.
Goodluck, and if you chose live plants, it is worth it 100%