I sold my 2010 320d last month via mudah and I can honestly tell you that there is genuine demand for this model.
I had 3 viewings, with the third one sealing the deal via an immediate deposit. The earlier two came later with an approved loan and one wanted to pay cash but he was too late. Thereafter, just leaving the ad on mudah pending the completion of the sale, I had 5 other what sounded like serious enquiries too.
I think the BMW Diesel engines have finally gained mass acceptance. What is there not to like really? Superb power delivery coupled with remarkable fuel consumption and the famed BMW M sports handling. Personally, I'll pay a little bit more and choose the 2010 184hp model over the 2009 ones (in fact, that's what I did and insisted to see the spec sheet printed from AB before I chose the car). With a slightly more powerful engine and an uprated torque converter, you are more confident that it can take the extra stress when your power hunger pangs strike. Get the ones with the Powerkit installed as the additional cooling hardware will help heaps too.
Good luck in your search. You will not regret this buy. Price per volume of pleasure, there is simply no match!
Btw, my brother is selling off his original style 193M rims, it's painted powder coat gun metal grey. No cracks or dents, unused and ready for installation. I think he wants $3500 if anyone is interested