Give me your opinion.

So I have been looking at German cars for quite a while and there was lots of cars in my wishlist but these 2 are the favourite ones , w211 e280 cdi and w204 c200 kompressor . W211 has got the old mercedes luxury whereas w204 is still good but it's quite plain. I am not sure which all are the common problems , cost of periodic maintenance, parts , etc. If there is any w211 or w204 Owners please do give me a feedback . Thank You.