mine is the 4 cylinder kompressor sport model 2.3litre supercharged, 140k on it now (put 20k on myself) and had no problems except routine servicing and a about 5k ago i changed the clutch as the original 11 year old one's release bearing was whining.
as for kit mine has
heated mirrors,
leather,
electric memory seat,
leccy windows,
dual zone climate control
leccy sunroof,
cruise,
and quite a few other little bits like being able to drop the rear headrests by pressing a button.
the sport model i have has lowered suspension (this gives quite a bumpy ride though), sport bumpers and AMG monoblock 17" alloys, mine is also a manual which i would probably not choose again the manual box is clunky and not the best.
mpg i average about 25-27 which i guess is not to bad for a 240bhp (actually 237 when rr'd) car (stock these are 192bhp mine has had a kleeman sc pulley and remap to suit)
common problems with the age of 92-96 cars are the engine wiring harnesses being made of mercedes own biodegradable cable. this is the biggest cause of the "OMGZOR IT SUCKS AND BREAKS DOWN LOADS" crowd, basically if your good with a soldering iron you can redo the wiring harness for about £30 in automotive cable and never have this issue, this is the next job on mine. the other option is to buy a new harness from MB for circa £1000, however this problem is most common on the kompressor and 6 cylinder models due to the extra under bonnet heat.
Rust wise i have only one spot on the drivers door about a 50p size paint buble just under the rub strip.
the phase 2 cars (post 1997) were supposed to have quite a few quality issues phase 2 models are easiest identified by the aerial, on ph2 the aerial is built into the rear window ph1 cars have an electric aerial coming out of the passenger rear quarter.
i guess my car would be compared to a e36 325se personally i prefer the merc i expect that is a slightly biased opinion though.
regards
Andy