Our region runs fast and open autox courses, sometimes with really quick sweepers, and I'm interested in adding some downforce. My vee is fairly balanced and doesn't get too upset unless the nut behind the wheel makes a mistake, so I'd suspect that a front/rear combo would make sense rather than just some huge rear wing. At it's core is a Vee, but it's much quicker with around 110-115hp, 225/50 slicks, and many, many other upgrades.
Assuming bodywork is not an issue, what's out there? Maybe a supervee rear wing would bolt to the VW transaxle? I'm not interested in looking like the Wright Flyer, but something to add that extra edge would be nice. Let me know if you've got a line on something for sale as well, this stuff is hard to find.