CPD's will feel much more secure with a lot more plants. Also if you could float some water sprite or something they would really appreciate it.
For plants, check out plantedaquariumscentral.com too. Granted I've only ordered from her twice now, and the first order was EHHHHHH. However my latest order was beautiful stock. She also tends to give you extra on certain things, which I find to be really nice (not sure if other companies do this, as I haven't ordered from other places, but I hope they do). Example is I ordered one java fern, and got three. ;3