If you have any interest in control-line,fly a Brodak kit, with a throttle conversion.
Brodak Mfg.:
http://brodak.com/
Sig also supplies kits for RC and C/L, in the smaller sizes.
Sig Mfg.:
http://www.sigmfg.com/cgi-bin/dpsmar...L+Sig+bbac2650
BMJR Models offers FF, C/L, and RC kits in various sizes.
BMJR Models:
http://www.bmjrmodels.com/
Most kits are .049 (1/2 A) or .35-.46, but some are offered for a .10 engine.
If you want more options, the only thing I can suggest is to convert an electric park flyer to nitro power.