even though kbb lists our w124's for a certain price, it is nearly impossible to find one for that range that has all the gadgets in perfect working order. experience tells me that, it is important for you to have a car that you can trust on the road from a mechanical point of view and one which is not prone to frequent failures.
you mentioned that this is your daily driver, which leads me to believe that it doesnt leave you stranded on the side walks. with that said, all the things you have mentioned are not show stoppers. meaning the car will continue to run, perhaps not in pristine condition.
I suggest you keep the car and setup a yearly budget that you would want to spend on the car. and with that budget start investing in the repair with the most imporant to the least. this way in due time you'll have all the repairs done and you won't feel like you've invested a million in the car.
everyone here in the forum has been doing the repairs which are never mentioned during the calculations of NADA or KBB values. that is why when you are in the market to find a good, well taken care of, example, the asking price well exceeds the fair market price dictated by the whole sale price books/websites.
hope this answers your question to some degree.
good luck.

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