Just traded my '01 in bc of a perfect storm of problems. 08 328i's w/ CPO (sedans and coupes) are going for 20-27k and there is 0.9% financing going on. Also saw a decent number of 07-08 335i's available in the higher end of that range (not necessarily CPO on these). Not sure if youre interested, but it would rule out the maintenance cost for at least the rest of the CPO.