Is the current VC box giving you problems or what is the exact reason for moving it? Moving it to its own box and its own instance of sql sounds good but just run out VC server off of a physical server we reclaimed (duel proc, 1.5gb ram, gig nic, raid 1 hdd setup). It seems to run fine for us, but we are also smaller than you. I'm sure any server you buy now with simular setup as the current one would run fine.