You have a couple of choices
1) a CA Models 24% or 26% Extra 330 (depending on how overpowered you want it)
http://www.camodel.com.ar/
2) Wendell Hostetler 25% Extra 300 and get a kit cut for it. There are a number of cutters who do it and it is no problem to find one.
http://www.aero-sports.com/whplans/
Mark