Microsoft SMS vs. novadigm software and other software?!?!

Question

Hi! Imagine you have a company with aprox. 500 Client PCs. It is a windows 2003 domain. Suddenly you want to install a certain software on 289 of 500 PC. You have 1 hour for this job… or you can pack your things… what do you do? We are looking for a solution / software that can handle Microsoft SMS (Software Management Services), updates and inventory fully automated. We looked at the solution of novadigm (http://www.novadigm.com) and Microsoft SMS. Has anybody worked with those systems? What about the idea of keeping the images of OS and applications separately. So you can install any possible combination of applications on any OS according to your Company policy. We also need an automatic inventory service with web access GUI. Any Ideas or hins? So long gicio