The Phoenix Extra 330S .60 ARF might be a good pick. It's going to be more aerobatic than the Phoenix Tiger .40 you're already flying, but not a huge step up with regard to the skills required to fly it. Extras tend to be more stable and exhibit fewer bad tendancies than other scale aerobats like the Yaks or Edge 540s.

With low rates, you should be able to enjoy some nice relaxing flying with the Extra 330S .60 ARF. If you want to crank things up, just increase your control throws, move the CG back a little bit, and crank up the power.

The Phoenix Extra 330S .60 ARF doesn't have a reputation as a particularly good 3D airframe, but it should be a lot of fun for either mild or wild sport aerobatics depending on your mood.

Good luck and good shopping!