I just got 6 Dell Vostro Win 7 Pro boxes and 4 21 inch monitors for under $3000. As most of you know, Dell is always having a sale that ends in 3 days :-)
In my experience, it is a better deal to just get new hardware than try to upgrade the operating system on an old system. I sold my old XP3 boxes off to the employees for $50 including 17" flatscreen LCD monitors. They were happy to get the deal and the systems are more than adequate for web surfing , email ,facebook, etc.
