I've been looking at facelift Z4's myself, kind of a market watch pending the possible sale of our X5. Values for '06 SE's seem to be around 6-8k depending on mileage/spec....there are a few around for more but they have been for sale for ages. On top of that, as has been pointed out, it's a bad time to sell and although the 2.5 is preferable, the 2.0's are probably an easier sell here.