LabExpert by Altiris (www.altiris.com) is good also. For identically configured systems, HW & SW, this product uses one master image and two registry files for each PC supported. Recovery is great; it downloads the master, reboots, downloads that PCs registry settings, reboots to the OS. We use it to support our computer labs.
NT and NT RK Tools offer sysdiff and sysprep that you can use with imaging software to get around the SID issue. These allow you to configure OS plus applications and then clone the image to identical HW platforms.
Another thing you can do to reduce the number of rebuilds is to use policies to control what the users can do to themselves.