I recently bought a 1998 M3, it had 69K on the clock, perfect condition and got a 3 year 36K mile FULL WARRANTY for it from car max. I love the car, it has a few things here and there that could be better, but it looks GREAT, drives GREAT and if it breaks it gets fixed on the warranty. Go carmax if you can.
I paid less than 21 K total for the car and warranty.
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05 WRX STi
--98 M3-SOLD " I miss you dearly"
---87 Porsche 944S
----94 Toyota 4x4
-----82 Yamaha XJ750 Maxim