History: Updated to ML. Worked great for a few weeks, then what I thought was ML was actually my HHD. I would get really slow and programs would beach ball, then come back to life etc. Shut it down and couldn't get it to restart tried everything to repairing verifying everything. So I had to reformat and do a fresh install via ML USB installer, now I keep getting the same thing on a fresh system "kernel disk2s1: I/O error" ANYWAY... so now that from what I read this means that my HHD is on it's way out, I wanted to upgrade to a SSD/HHD hybrid. But I'm not sure which one to buy? I am going to have a local shop install it but they said that I need to buy it from MacSales.com or something like that and give it to them. HELP!