I'm a Professional X64 user myself. Never saw any reason to go to Ultimate, since the Pro version has virtually all the same features except for a BitLocker, 1,256 foreign languages, etc.
I don't mess with folder or file encryption since I've never had a need for it. Besides there's a free app available that is better than BitLocker.
Besides... ain't I a Professional? LOL! I'm not "The Professional" though, cause woolen beanie caps make my head itch. Have similar shades though.
Anyway, welcome to the upper-echelon of Windows 7 users now BassFisher!
I believe that Pro and Ultimate are more efficient at using and allocating RAM and other resources. If I am wrong, I'm sure I'll hear about it.