Just my $0.02, but a Sky Scooter Pro/Pro2, ballasted with a pack of Radio Shack 1600 NiMH batteries, can handle quite a bit of wind.

The Slow Stick will handle wind a little better if you clip the wings- use a metal ruler and a #11 blade to slice off the wingtips at the outermost molded rib location. The reduction in wing area helps avoid the "floats" when the wind picks up. A heavier battery helps here, too.

If you're into building, any of the Herr "Breezy Day"kits do pretty well.

Hope this helps,

Steve