Its got a bit higher mileage than you were looking for, but this 2012 rwd/m-sport is still available https://www.facebook.com/marketplace/item/292893695235206/?ref=search&referral_code=undefined
My 2 cents on an e91: From what I've read while I was searching (I haven't driven an xdrive to confirm this), the xdrive cars handle noticeably worse than their RWD counterparts. You are welcome to take mine for a spin to compare while the other one is still fresh in your mind, it's rwd/sport/auto with 102k and basically stock (aside from the exhaust and a euro intake) for reference. It still has the original suspension and on soft snow tires so its probably not the best example ever, but gives you a decent idea. With decent summer tires, I think the rwd/sport combo handles really well and is also surprisingly comfortable for long drives. I've had zero regrets with it so far, typical BMW issues aside. The extra space and practicality of the wagon is worth the price premium and weight tradeoff in my opinion.