Your two choices are 328 the better of the 308 line, or a late model 93 on 348, both are incredibly easy to work on with tonnes of on line help to search from. The ECU on the 348 can be read without a PC hook up.
A well sorted 308/328 requires surprisingly little work to begin with. Regular (semi-)annual maintenance (changing oil, filters, other liquids, that sort of stuff) plus distribution updates once every 3-5 years or so. Plus of course repairs should anything break (which happens, these things are 20-30 years old and meant to be driven hard) and replacements like tires etc.
And these cars are indeed relatively well-built and practically laid out. I know a number of people who do almost everything on their 308/328s themselves, including: belt changes, clutch replacements, electronics repairs (relays and that sort of stuff), etc. etc. As the last in a long line of development, the 328 appears to be the most reliable and well-thought through and still has limited electronics to deal with.
In 308s, you may have to distinguish somewhat between carburettor and injection versions, the former requiring a bit more work, but as I'm led to believe in the end-run easier to repair/adjust etc.
There are lots and lots of posts on the various fora that may be of use, many with pics to guide you through quite a few of the operations you might be thinking of.
Have fun with it!