I currently own a C180 Kompressor Elegance Package (W204). The C180 and C200 use the same engine (the M271), the only difference is that the C200's ECU is programmed to extract slight more HP from the engine. Everything else is exactly identical.
Your father is absolutely right about the maintenance part. Something always goes wrong with these German machines no matter how well you keep them because you never how the previous owner kept them (I've driven mine only 6000KMs since I bought it so haven't experienced anything major yet lol
). Unless you drive in protocol with 2 Land Cruisers accompanying you from the front and rear, every bike/rikshaw/taxi wala will try his best to scratch your Mercedes Benz. If you park in a crowded area, people will think of it as their duty to swipe their hands on your car out of jealousy. Most importantly, the standing star on the hood is a hotcake for thieves. It costs Rs. 12,000 from Shahnawaz (for the W204) so its not cheap either. One front headlamp (the adjustable one) for the W204 costs almost Rs. 125,000 from Shahnawaz, excluding fitting. The ground clearance is not adequate and taking into account our roads, that is not a good recipe.
As a daily driver, I would never recommend a Mercedes to someone in Pakistan. Considering our traffic situation, these machines are only good as weekend cars. If you buy one for daily use, I can guarantee you it will end up as a garage queen. If you have really deep pockets and a lot of time, only then get a Merc.
If the previous owner didn't treat it well, you'll spend most of your time with mechanics who will try their best to rob you because "Marcadeez awner". You really need to have some knowledge about these cars to avoid getting scammed by mechanics here. They will tell you that your suspension is broken when it only needs a proper alignment.
The Civic Turbo is a good choice. The Corolla is due for a facelift (no exact date specified for Pak though). I would personally recommend a hybrid for daily use. You can get a high spec'd Prius or Lexus CT200h in your budget and still have some cash left over. You'll get at least 18KPL from either of these cars and they'll be safer than both the new PKDM Civic and Corolla. Both the Prius and CT200h use the same engine and drive-train so general maintenance is no issue. I'd try to avoid anything PKDM unless its absolutely necessary otherwise you have a wide choice of Japanese cars in your budget. There are lot of experts on PW who can guide you better about Japanese imports
Hope this helped.