i've seen some cheap bmw's aroudn and have heard that they can be pretty fast, specifically i've been looking at the late 80's bmw 325, is this a good choice? i've also seen the older m3's, a dream car but out of reach for now, but any way to convert a 325 to be an m3? engine swap, etc., and any other cars that are available made by bmw that are around or under $3000?