Well I'm in the same boat as Trips! I have a 2008 4.8i beyond loaded with every possible option. I bought it in spring 09 and it currently has about 25,000km (15,500miles) on it. I could not wait until the end of the year for the ///M as I sold my last X5 and I was actually renting a car for two months. I gave my 5 series to my Dad to drive, and I wasn't about to ask for it back! Plus I had no idea at the time what the X5M would look like or what the pricing would be. Meanwhile I was getting a great deal on an 08 with every option, so I pulled the trigger!
Fast forward about six months and I can't sleep at night 'cos I keep thinking about the new ///M. I actually bought mine, not leased as the lease rates and residuals in Canada are ridiculous. So the dealer wants somewhere between 25K - 30K down to maintain the same monthly payment. Actual price difference between the two is approx 40K!
So I could put down 25K and bump up the pymt just a little OR I could keep the X5 and put that money towards a summer toy such as a used SL55 AMG or E55 AMG or M5 etc. Problem is I only have a two car garage and insurance will be about 3K/yr for the summer car alone! What to do??
I guess I could advertise it privately and see if I get any bites...