If that is the car you want to have for a while, then by all means fix it.
I wouldnt worry about a scan tool at this point. You can get codes read for free at autozone or advanced. I wouldnt put too much worry in that.
Seats and carpet are important. A paint job, at least a good one will be exspensive. You could go to econobake , just do a good job prepping it as they wont for the 299 they will charge. Buy your own pait too, theres isnt real good. Basically you are just paying for a spray booth and a man to spray it.
I wouldnt spend much on a low dollar car like that , but thats just me. I have to agree, it is a comfortable car.
Fact is stranger than Fiction