I am contemplating adding an SSD to my late 2011 2.2 Ghz quad core 1.7 MBP. I am looking at the crucial 512 gig or the SanDisk Extreme Pro 480 gig ssd's. Other than the 32 gig size difference ca anyone tell me the difference between these two drives and if one is better than the other? I already have upgraded to the 8 gig max (apple spec) max. I often run parallels and mac apps at the same time working with large spreadsheets and pretty intense graphic editing.