Being that you have the same hardware accross the board you should be able to get by with three images as you suggested, tho you'll still probably get new hardware detected on the first reboot after cloning. As for deploying images, I implemented Ghost Solution Suite 1.0 (Ghost 8.x) a few months ago and it has performed well (and yes, the Corporate/Enterprises releases of Ghost can reset SID's... sysprep is not required for this). Solution Suite also allows you to clone workstations remotely through the use of a win32 client - no need to visit each workstation. As for sysprep, it really shines in it's ability to migrate an install accross various hardware configs. This isn't so much of an issue in your case, but it would provide your users will a cleaner first login after cloning. I use sysprep in my images as i've got 6 "standard" workstation models to maintain (P4 i845/ i865/i915 machines w/ various hardware differences). One sysprep image goes accross all.