Thanks Niall for your response...
We do already have a relatively thick image, however I work in an environment with over 4500 PCs and some 400 different applications that have no strict pattern so we can't even create multiple thick images for different departments to alleviate this problem.
There must be a better way to achieve this solution? Generally I would rebuild a machine in our lab - is there a way to speed up the software distribution to a particular group or IP range in the lab? What determines how quickly a package does trickle out with SCCM?
Thanks again for your help!
Cheers
Matt