I went with the Wisteria as a floater. It really does look pretty good and it doesn't block as much light as I was worried it might.
I was a little surprised that the first ones to play in it were the shrimp. I had only put a few stems in and they were swarming all over it. Then the Betta started playing in it. Now the frogs are reluctantly venturing into it.
I'm really happy I was smart and quarantined the stuff though. When I got home I put it in a bowl full of tank water and swished it around. About 10 snails fell out. Then as I moved it to the aquarium I went over it stem by stem and found another 5. I chose to keep a couple but culled the rest. I'm certain they would have taken over if I kept them all.