Ask for help with the purchase of 645ci / 650i

Hello together I would like to introduce myself briefly here. My name is Phil and I come from the south of Germany (wine garden) and currently drive an Audi A5. I have been looking for a 6 Series BMW for some time now. I haven’t driven a BMW yet or I have little idea about the cars myself. Nevertheless, I have already informed myself a bit about the 6 Series. – The 645ci existed before the 650i. If you had the choice between the two, you should grab the 650i or is there s pure preference? From consumption the two don’t give themselves much and the 650i has a few more hp, is that serious? – What exactly should you pay attention to when buying a 645ci/650i (I once read something about defective water pump(was that correct?) or engine problems with the 645ci)? – Which equipment extras would you not miss e.g. HUD, Dynamic Drive (is I responsible for the improved curve behavior or?) or what would you advise against because it e in the last few days I’ve been driving around intensively on mobile.de and I’ve picked out a few things that I’ve personally put into my eye or liked. For me, must-haves are actually just head-up display, navigation and leather equipment. Nice to have would be Night vision (but that’s probably more likely to be with the more expensive ones) and TV. I’ve only had a test ride with a 650i with S for the next weekend. MG and can thus not say anything about automatic, circuit or the SMG yet. In the A5 I had a switch, I would like to have an automatic now in the 6th but if only with paddles on the steering wheel (is there this the 6th?) I picked out a few here, maybe one or the other thing about the vehicles can tell me something or advise me. I would be very grateful to you! Sorry for the many links 1. Advertisement 2. Advertisement 3. Advertisement 4. Advertisement 5. Insert at 7. Anzeige 8. Anzeigen In advance thank you for your help! Greetings from Lake Constance Phil