If you have CRTs and that powerful of a system, make sure you get a > 1000 VA (VoltAmp) UPS to adequately protect against power sags/surges (APC makes the best kind) by providing constant power and power conditioning as well as being able to fully carry a 7-10 minute load for your PC and monitors. When you get LCDs the 1000+ VA system should be able to carry the load better, since CRTs suck power and LCDs are pretty conservative overall.