I have an opportunity to purchase a 1984 300SD. 200k miles, 1 owner. I saw and drove it today; it drives ok.

Here is what I saw that it needs:
- pulls to right; owner says mechanic told him it needs a new ball joint (apparently this is the only work needed to pass safety inspection)
- climate control and radio stopped working recently (owner will fix before selling)
- air conditioning has leak; freon gone - ouch!
- driver's seat needs to be redone/recovered
- dash top has some cracks
- some fogging (delamination) around sides of back window (3' in only so no big deal)
- power seats work intermittently
- some rust, but not rusted through anywhere (1 corner of sunroof opening, right headlight, around rear/trunk, etc.)
- original paint
- interior needs a good cleaning; looks a bit old and used; actually looks like a normal car would after 18 years
- leather on front seats a bit cracked (figures given age)
- tires are ok, but nothing great
- 1 rim has a bit of a dent, but seems ok still
- small hole on 1 pipe at muffler exit
- partial service records; I should be able to find out where it was serviced.
- engine looks ok, but could use a good cleaning

I am planning on having a garage (not MB, but a place that sells/services them) check it over for mechanical soundness, especially the suspension, engine, turbo, transmission. I assume these items will be ok (if not, I'm gonna pass on it, especially since I don't really need this car; it's just another extravagance).

I should be able to get it for $2500 US, maybe a bit less. How much (roughly) would I need to spend to get it back into proper condition?
Any idea on the costs for the dash, new seat, power seat repair, AC, rust repair?

Thanks to all,
...karl