I'd forget the age requirement and find the very best E46 M3 you can find for your budget. They are a league ahead of 200bhp hot hatches and things like the R32 and I don't think there is a better value performance car out there that offers the same level of quality and reliability. Sadly they have like each M3 before them fallen into the land of 'izzzzzit' but that doesn't take away from the fact they are fantastic cars to this day. Mind the 19's look so bloody out dated these days, CS model is the one to get.