but what are you going to do with 64gb?
install windows 7, photoshop, microsoft patches, few apps then where are you going to store your pics or raws?????????
space per performance too....
I already have a file server with 2x 2TB drives that I store everything to. Set up in RAID 1 for redundancy.
I already have a 64GB SSD on my laptop anyways, and I've Windows 7, PS CS5, LR3, Office 2010, Chrome, and the usual IM/music/video programs on 30GBs.

