RE: Next step up...
What type of flying were you into when you got out of the hobby previously? The U-Can-Do and or Harrier would both do well at slower, high-alpha types of aerobatics. Both are very capable of floating around on their big wing but the trade-off is that they don't handle speed so well. If you are into more traditional sport aerobatics then the Stik might be the better option. The Stik will likely be a little tougher too. No real wrong choice, it just depends on your interests.