Recently I've been asking a few questions on spec etc for a MBP 15", and have come to the conclusion that the lower spec MBP is ample for me in terms of processor and graphics card, so there's no point in paying £300 ($470) for the higher spec one. I would love a SSD but need 500GB minimum, and Apple want £960 ($1500) to upgrade tot he 512GB SSD, which I'm not prepared to pay, so was going to just pay the £120 ($188) to upgrade to the 750GB 7200rpm sata drive. However, I've been looking around the internet and come across this at crucial http://www.crucial.com/uk/store/mpartspecs.aspx?mtbpoid=3D217106A5CA7304. This costs £522 ($820) which is much more reasonable imo. However, I'm new to SSD's and so have no idea what's classed as a good/fast drive. This one at crucial has a read speed of 500mbps (SATA 6GB/s), and a write speed of 250Mbps (6GB/s), is this considered fast, slow or average? How does this compare to the read/write speeds of the 7200RPM SATA drive? (anyone know what the exact speeds are?). What does it mean when it gives a speed such as 500Mpbs, and then in brackets "SATA 6GB/s"? Also, if I do buy the crucial SSD how do I trnasfer the OS X lion and all installed software from the preinstalled drive to the new SSD one? Cheers.