First part of my two part question. Would you guys go for a external HD with 1 TB at 7200 rpm at 3.0 GB/S or 640 GB at 7200 rpm at 6.0 GB/S? Size not that big of an issue. Does the transfer speed make a big difference? Secondly... I plan to also connect this to a pc with an esata port (the HD has one too). Will this give me close to internal HD speed? Sorry if this is real noobish.