I haven't flown one but my customers telll me the Sig Akrobat is a good next step that can be set up either as an intro to stunting or can do most of the Pattern manouvers.
The Flite Streak is another that comes to mind. Both of these airframes are profile so only the wing needs to be built then covered.
There are also the Brodak ARF's.
Do you already have an engine to use?