Has anybody traded in their X3 (to the dealer) in order to upgrade/buy a new BWM?

Just curious as our family is growing and we'll likely be too big for the X3 in a year or so.

We have a 2006 X3 3.0 that is pretty loaded (nav, hi fi, heated seats) and, as now, it has about 11,000 miles (we live in NYC so driving is limited). It has a few little nicks on the back bumper (again city living) but otherwise I keep it very clean.

Just wondering about how much I can expect in trade in value, assuming I take it in for trade in Fall 2009 (which would allow me to get a 2010 model).

I love the X3 but with a kid, a dog and likely a second kid on the way by then, we'll probably bump up to the X5.