Not to be a dick, but you realize real M3's are going for 7-10k? In fact there's one for sale by another member, rust free, at 6.5k (may need some engine work).
1998 BMW 328is - summer
1993 BMW 525i - daily
1994 BMW 325i - sold
1992 BMW 325i - gone
1988 Mercedes Benz 190E 2.3-8V - sold