I would sell the Mac and use the cash to buy a new 580 series mini if a mini is what you want. My two year old mini with the heavey barrel shoots very good groups and is much better than the older minis. Sounds like your gun might bring close to enough to buy a starter AR and then you won't have to listen to all the experts who haven't shot a new version of the mini give you their opinions based on no real experience.
I have has a couple of guns I probably shouldn't have sold but since I didn't like them they were of no real value to me. I sold them and bought guns I enjoyed shooting. I don't miss them at all.