Thanks for the reply
Steve: Mame nowadays works much better; few years ago was garbage but it seems to be decently good nowadays. They also had a nice fronted for a bunch of emulators (was a rom manager for mac), but it was abandoned, so it never made the transition out of the rosetta; so when Apple moved on, the thing won't work anymore (altho the single emulators still works fine; go figure).
AMwiggyx: The point was to use what I have already
Selling my mac means to make probably 100 bucks, which are not even close to buy a new rig (even if I don't need the case after all, it goes in the cabinet).
I could just install windows via bootcamp, but I don't see rom managers for windows either; other than Mame itself (which do not delete roms btw, you can just use it to launch games). Unless I am missing something