Favourite q car ever was Mk2 Cortina Savage, 3 litre Essex lump in place of the usual 1600, now that was a great car wish I still had it worth a fortune now!My M135i replaced a 335d with that engine. One of the best diesels you can buy.
But don't forget, M sport is just visual; no extra performance (I spent ages looking for my 335d as I wanted an SE on 17s for the stealth look).
Also chose grey for our M135i because it "hides" the M Performance bits; the grey wheels, mirrors and the black exhausts. I go great lengths to get Q cars when possible!