gotta be a smart a** and give you a couple quick answers.
leaky injectors, is it the return lines leaking ? replace um. they are inexpensive..
brakes are a tuff one. " don't back up, no noise" (sorry could not resist)
lots of miles but if its been taken care of mechanically, just buy it and use it !
repalce the trunk seals if they are leaking. no one like wet bags of groceries to carry in the house. . .
if the tires are good, transmission shifts ok (or is it a manual) stops good and starts good, chage the fluids and filters and drive it, enjoy it.
paint jobs are cheap in some parts of the country (not around here) so its a matter of $$$ for pride of parking it on the street and being proud of a 30 year old car.
value ? humm. . .depends on where you are. arond here in the salted northland it might bring 12-1500 bucks if its not all rusted to death. there are few to choose from up here. in the east, there are a lot of them so they may be cheaper.
there is lots of help around the forum for any problems / repairs you would need or want to fix.
what does your gut tell you to pay ? and how about some pix;s ?
davidh, (one of the elder members)

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david h
83 300D Alabama Beauty (Son's)
83 300D West Coast Rust Free that been abused