New guy needing advise on purchasing a car

[Ozzie CPT SA]

Hi everyone, I need some advise from the guys with experience around buying and selecting either a new car or a slightly older but more luxurious car... I'm torn between getting myself a few older cars which 1: 2009 c63 AMG 2: 2008-2009 e92 M3 or buying the Golf7 R 2015 or the merc A250 2014 model. My question is with me buying any of the older cars will it end up being a headache to me? Will I end up having either one of the older cars at the mechanics with problems all the time or will it be reliable? I really love the c63 and e92 but I am so afraid of having problems... I really want it though... Please help anyone