I was wondering about the Anytime option and simply frowned at downloading the OS rather then seeing a clean install. Any time you change even the current version of Vista unlike XP's repair install option plan on reformatting the drive as well. Vista loves a fresh partition to go onto.
Having a full install disk and not simply an upgrade disk is the preferred option for just about any version of Windows especially Vista. MS is dropping the price a little on Vista as of late while OEM for system builders is still going to be a better buy without the retail box.