Diesel Benz
MB Enthusiast
Yawn
again pointless and irrelevant
yawn
Perhaps you got an impolite comment, perhaps not but I hate it when someone asking for help, spends time criticizing the feedback. I would ignore all negative comments at least up to the point my problem got solved. Now I'm hesitating if it makes sense to contribute with the risk of unwanted feedback (justified or not).
Anyway, the prefacelift 204 had a relatively cheap OEM retrofit solution for navigation called UMI or Navigation 20. I installed this myself when we had this car in our family. I'm sure the parts are not any more available from MB dealers but one might find a second hand set from eBay.
I wouldn't install Chinese after market kits which more or less leaves option 2 from markay's list, perhaps 4 or 5 too, and option 6!