in the grading of cars
avantgarde - means avantgarde - aka very basic - imagine as corolla XLi
elegance - cute chrome parts and lightings, wood finish etc. SE Saloon or Altis
classic - run off the mill. GLi
kompressor = supercharger = more maintenance items (e.g you wont be able to find the right supercharger oil for it) and when it wears out its very damned expensive - better to find a 6 cylinder NA engine car for the best experience, MB do make okayish 4 cyl mills but to be honest their 6 are LOVE
As with every other car the build is a bit different, the problem in Pakistan is that for Honda/Toyota/Suzuki - mechanics simply slap on scrap parts till the thing works, This is not possible with benz because firstly tons and tons of scrap parts are not simply lying around and secondly the diagnosis tools are a bit unique.
You can then tack on the fact that average 10 piece toolset mechanics may be able to service a japanese econobox shopping trolley but not anything else.
Parts are not bad to source out but make sure you dont simply follow the "sab se sasta dikhao" mentality - sastaa and mayaari doesnt quite work out - EVER. some parts should never be sourced from scrap like brake parts etc. but other dead weight hard parts like spindle and hub are perfectly acceptable provided they are not damaged.
For manual gear - I dont quite like them in mercedes because their automatics (the 5 spd) are simply fantastic and super duper long life. And the fact that their manual boxes shifting action is sloppy. (I think Im demanding too much, but I prefer the mazda click clack shift feel of the lever in any manual car)
For a good car - find one that is used correctly, not a garage queen, not a jannati car which never rolled on roads on planet earth, dont simply get awed by the champi paalish detail jobs - the car is under it. Get it up on a rack and inspect every part, move every lever in the interior, push every button. test every function. Drive it - remember that a mercedes benz sedan should not be citroen smooth where you dont feel the road even while driving over a crater the size of a volcano.
The benz feel is elastic yet firm, it gives and moves but in a limited way only.