I think the 09 as well. I always liked that combo (6 speed, sport, xdrive)
$6000 is a lot of money and for me personally the 09-11 won't have such a big price difference but the amount of Km's will will determine the price difference in the future.
I'm on the hunt for a e90 as well but not in any rush.
The only thing is that remember seeing that 09 for sale since summer 13' but it was 20k at that time. Just find out why it's taking so long to sell.