Sig Midstar, best choice.

a few reasons:
1) Sigs kits are some of the best quality I've seen, and the midstar 40 is laser cut, and its a complete kit with everything you need besides engine/radio.

2) Its a flat bottom wing, so you just lay down your main spar, and start slapping the ribs on.
3) Its a good 2nd airplane, good mid wing trainer, and it has an aerobatic mind of its own. It will perform good stunts with the proper engine.

Good Luck. Post pictures in the kit building thread so we can see whats going on!!!!

Happy flying.