Hey man at this point I'd totally give you $1400 on top of my [non-desired] speed cloth! I've been trying to convince someone locally who's trying to sell his 08 AW e92 w/ 28k for $55,000 to swap me his red interior plus cash, all to no avail.
I share your sentiment with buying a driver's M3 with no other motivation than to modify. Best of luck in your hunt... and if you change your mind, I'll gladly swap