In your position, if I didn't have the MX-5, I'd be looking for something more fun to drive than the Logan. But you do have it, and that makes the argument stronger for keeping the Logan.
MX-5s are great, but any old car will at some point need repairs / replacements, so I think having two old cars might be a gamble too far. OK, an old Volvo and (especially) an old Toyota would be less of a gamble - but they're unlikely to be any more fun to drive than the Logan.
Maybe keep the Logan and save up for a bit for an eventual 6-cylinder replacement for the MX-5?
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