I'd rather have the straight six than the V8, but I'd still take the Tuscan Challenge. It would be GT1/SPO, but I don't think it'd get walked on neccessarily. Wouldn't dominate though. And they are hard to drive, fickle, angry machines. That like to catch fire.

TVR 400R, personally, but I'd have to find some way to street it. Maybe just take all the money I saved from buying it rather than a Ferrari and use it get it streetable.