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#11
I recently installed a full Win 7 Ult to a 64GB SSD and moved my User and Program data to a separate HDD. The full install with NO programs was 15.5GB with all drivers. After moving those two folders, disabling Hibernate, and setting the Page file to 1536MB the install occupied less than 9.13GB on the SSD.
Semi-new build.
User Profiles - Create and Move During Windows 7 Installation
Windows 7 is the first OS to support TRIM, XP does not.
Win 7 works at its best with a page file, but I've found it doesn't need 2 times your installed memory, which is how much will be allocted by the OS unless it is changed manually.