A 15" MacBookPro5,1 (2008) Supports SATA II. And for this MBP, the newer SATA III drives degrade to SATA II speeds, providing no extra value for a lot of extra cost. Intel 320 series is an SATA II drive that has been noted for its reliability as well as good random access speeds. I want to compare Intel 320 to A-DATA's S599 drive -- a not often mentioned drive on these forums (I mroogled). According to http://benchmarkreviews.com/index.p...sk=view&id=484&Itemid=60&limit=1&limitstart=8, A-DATA's S599 seems to outperform even Intel's X25-E drives for linear reads and writes. According to the author: The A-DATA's S599 seems like a better option. A 256GB S599 is now $531.14 on amazon, compared to $548.99 for a 300GB Intel 320 on newegg. Tired of researching; time to get this deal done!