only do this deal if you are getting some cash along with your BMW.

I currently have a low mileage M3 EVO convertible for sale similar to yours and have a good idea what they are worth (even though these M3's are horrible to drive they do hold their value if low mielage and fsh).

Evo's great fun, no doubt about it (have owned a few VI, VIII MR etc)) but the 5's are all imports and dont have a huge value today, even for a really good one the prices have dropped, as you can now get a very nice VI, UK supplied sub £10k (sowhy pay a lot for a V?).
V near enough as great to drive as a VI, and slightly less aggressive looks, and rare in UK, but not worth a huge amount....