Amazon swords without a doubt. Heiko Bleher himself told me he was pleased to see two amazon swords in my discus tank. They are also a good spawning support.
Vallisneria will grow well and suck in loads of nutrients, but you have to be ready to keep containing it or it will spread in the whole of your tank.
I also have a tiger lily, and it's doing ok, apart from the surface leaves melting. Just prune the leaves before they reach the surface and you'll have a beautiful plant.
Eleocharis will grow well. Depending on the species it will grow to different lengths so you can have a lawn or you can have a patch of tall grass. It will spread, but not as fast as vallis
Sagittaria is also a good foreground plant, it might grow really tall though. Never seen it myself TBH, but Tropica do have this warning.
Hygrophila is also a good plant, and if you have an open aquarium it will grow out of the water. If you like that kind of thing it could be a good one for you.