If you decide to step up, don't go for the Cap-580 or Funtana. They're great but still too much for a second plane. I decided I was going to fly a Sukhoi when I wasn't ready for it. I gave it a little too much elevator and it snapped. Unfortunately I was very close to the ground. You can guess what happened. Look at something like the Sig 4-Star, Phoenix Models Dolphin, Great Planes Rapture, etc. These will do more than your trainer but are still very stable, predictable, with good slow speed characteristics. As others have suggested, a stick might not be a bad idea either.