I got my 840i recently, with BMW Personalised Pricing in the UK, you get some discount on parts and realistically it didn’t seem too much more expensive than for example, a 4 series. Pricing tyres I can find them for same price/cheaper than 19 inch tyres for the old 3 series

A had a 220i loaner car and was very unimpressed with the interior. I’d imagine the 3 is going to be better in every way (apart from the exterior look) but then again depends what your priority is

Done very similar recently. Yeah at that age, you want to make sure the spec is what you want. I think the car will normally be fairly solid if it is approved used and has warranty