Hi folks, I am looking 840i grand coupe or 4-dr 440i as a potential next car, surprisingly found a slightly used 840i is not that much more than a same-condition 440i, probably 65k vs 55k for a 2yr 20k miles? 65k is my budget. To 840i owners, will it have more maintenance cost than a 440i, and is it a good idea to buy a 2yr 840i which is still under original warranty? 440i is also stunning but the 4-dr looks a little weird to me, for family reason I will need a 4-door (340i, 540i are not on the list as they look too ordinary :) )