TBH i think the fact that it is a ~£450 to tax a year will impact it's price and you then have a possible bargaining tool.
The thing for me is, i have the money now to get one, but i'm not done with my 330i yet. I can't bring myself to spend £10-12k + my car on something which is very similar. I'm certain now that i will wait until at least Spring 2012, continue to save hard, and perhaps a good M-Sport ED one will be in range.
Or a new 5 series with a decent engine.