Hi, I'm looking to upgrade my mac with a SSD, for better performance, and I'm keeping the stock 500GB HDD for storage. I'm going to put the SSD in the optical bay that should be fine for the mid 2012 macbook pro, right? I'm going to use the SSD for the OS, the application, a game or two at most, and other little stuff, So what size should I choose? Should I just bite the bullet and get a 500/512GB, because they give better and faster performance and guarantee to last longer. I'm going to use the HDD for storing my movies and music, and will use symbolic links, instead of creating a fusion drive. I'm looking at Crucial MX100 and Samsung 840 EVO, I've heard that there is a bug in the EVO that makes the drive really slow and Samsung has yet to fix it, but I'm sure they will and shouldn't be problem in the future. I've also heard that MX100 256GB isn't on par with the Samsung 250GB, is that true? As in the 500GB category they both are nearly identical in performance.