As far as tall plants, my Anacharis reached the top of my 20 gallon tall tank in about a month. Working on bushing it out a bit now. I've also just added some Cryptocorene and some dwarf lily's. The Crypt's are doing fine other than the rabid pleco attacks. I'm still iffy on the dwarf lily's. I haven't been able to identify exactly what species they are yet. Nearly black leaves with an arrowhead shape. It's supposedly low light, unlike most sun thirsty lily's, but like I said it's an iffy thing I'm waiting to see if it works out.
One side benefit of the anachris, it soaks up nitrates like a sponge. On the down side, it's edible to fish. Most fish won't be able to kill it, but you do end up with small leaves in the filters etc.