I have a Late 2012 Mac Mini (i7 2.6Ghz quad, 16gb RAM, Fusion Drive) which I'm about to change both my hard drives to a 500gb SSD and a 7200rpm 1TB HDD and am now thinking of upgrading to Mavericks (from Mountain Lion). Is the OS version stable enough now? I remember from the launch that many people complained about "beachballs" and bad RAM management among other problems, which is why I never upgraded. I'm interested in the multi display function of it but will stay at Mountain Lion if this will negatively affect me in any way. Btw, I solely do audio work on this mac (Pro Tools 10/11, Ableton Live 9, Logic 9/X) and will not continue to use Fusion Drive. Thanks!