It really depends on what your stock system is now and what you want to get out of the new head unit. If you are only looking for a basic 4 channel head unit with streaming audio and bluetooth phone, there are units out there for $100 even. Check out Crutchfield and see what they have.
For reference, I just put in a Kenwood KDC-X597 for $145 including shipping, wiring harnesses, etc.
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Present:
'08 e90 335i, '00 986 S
Past:
'99.5 B5 A4 1.8tqms, '02 e46 m3 convertible
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