In all fairness, my situation was different. I chose not to get the ///M from a practical standpoint. The biggest issue for me was the wheels. Those bad boys won't fit in the track at the carwash. Plus I figure nothing good can come from me having 550 hp. I decided just because I could, didn't mean I should. It also helped that I refused to test drive it.
I personally think the other posters are nuts to get upside down trying to get out of a lease or taking a huge hit selling a year old X just to have it now. But that's just me. I'm a girl, I don't share the issues guys have with needing the biggest one out there
I'll admit I wanted to get the first X6 off the line when my lease was up in 2008 but the timing didn't work. The 50i wasn't yet released and my options were slim. I couldn't extend that long and the cost to re-lease my E53 for one year was ridiculous. I leased my E70 for 2 years as a bridge car to get me to the 50i X6. I'm glad I waited, the X6 now has a performance upgrade that takes me from 400 to 440 horses. I would have missed that.