You could probably do well with just a basic symmetrical airfoil, like a NACA 0012, I bet. The pattern planes I've flown have had symmetrical airfoils.

You can look at M. Selig's airfoil site, although it seems to be down right now:

http://amber.aae.uiuc.edu/~m-selig/

Or this virtual wind tunnel data analyzer:
http://soaring.cnde.iastate.edu/calcs/frames.shtml