I have a 2010 mbp 15" with the stock 320hdd. I want to get a ssd in the opti-bay to run my os and apps off of due to the great speed the ssd offers.Im planning on useing my current installed hdd just to store my music photos and video but the workhorse drive would be the sdd. (if this is possible) My questions are... 1.How big of a ssd drive do I need to run mac os x lion, photoshop cs5 ,lightroom and mostly all my applications. 2.Do the generic hdd caddy's of ebay work just as well as the data doupler or mce optibay set up? 3. In order to run main apps and mac os x does the ssd have to be put in the main hdd spot and the hdd be put in the caddy position? 4. Would i have to do a completer clean install of mac os x to get this set up working? any info would be great Thank you guys so much in advance!