Looking good!
I would try and get some fast growers as well, maybe some Najas or Moss? Once you get your filter in I would probably wait a month just to make sure everything is fine and your plants start to fill in good!
I would go to the Swap n' Shop section to see if you can get anyone's clippings of fast growing stems to just have some plant mass in there so the tank should be more stable!
I'm expecting some good results here!
-Andrew