Upgrade or New

Just wanted some advice.  We are currently having thedebateas to whether we should update our current systems or getnewworkstations.  We are currently running Athlon 64 3400+with1.5 of ram and xp 32.  If we upgrade it will be going toxp64, 3gb ram and 10,000 rpm hard drives.  If we go new wewillbe staying with a single processor but they will be top oftheline.  Which is the better bang for the buck...andhopefullygive sw some better stability.SolidworksAdministration