I'm watching this thread with interest now as wife is getting antzy about replacing our S204 C220 that we've had since March 2012, is now 15 years old and has 125K on the clock. Also has cosmetic paintwork problems and have today found that what I expected to be a front brake pads replacement (about £160) is in fact a rear brake caliper and discs plus pads and will cost north of £600!! Personally I do not want to sell the S204, it's such a comfortable and practical car, has loads of toys some of which we've upgraded (reversing camera, front parking sensors, Comand HDD update for latest/last maps), full leather and 45 or better MPG, but wife says it's now too big for us geriatrics (especially for her to drive/park) and the cosmetics really annoy her but would cost at least £1k to fix. Man maths says fix the S204 problems and keep it, woman (no maths for her!!) says it has to go!
Investigation (second hand, <£20k) so far suggests contenders are Toyota RAV4 and auris, MG HS, MB B class and GLA, all petrol and auto. Have discounted the Toyota C-HR as the auto is CVT, likewise the Dacias. Still have to investigate the Kia Niro, Hyundai Kona, Ford Puma and Renault Captur