Cheap, go for the Belkin UPS Compusa seems to put on sale twice a month. Those will give you time to shut down during an outage. IF you want good, you're going to be spending $150-200 or more. Anything less than that and you're better off with the cheap ones. At the $150-200 range you get better power regulation and enough voltage that the current doesn't have to skyrocket to give you enough power.