Lets see.. IF you are a company of just simple means... 3yr rotation of gear is the typical norm. 3 years ago, core 2 was deployed. Win7 is not for the p3, the p4, even the athlon64, it is geared for multi core, 2GB or higher, and 2 years ago, 8gb of ram cost all of $140 (full reteail).. 8GB ram and a 1.866 core2=win7 working very, very nicely. The Aero (screen flipper) was a waste in my opnion, but the new aero, in which you hover over the taskbar icon of said app, just ROCKS..
The talk we have nowadays is reminiscent of win2000 --> XP days.. Either your company can afford it, OR NOT, boo hoo..