Need a UPS. What size?
 

I'm tired of my computer shutting down on me out of no where and potentially losing work, so I need to pickup a UPS that will power my desktop and three 19" monitors for at least a couple of minutes. I live out on the middle of no where and our power seems to randomly go out for a few seconds and pop right back on every now and then. Problem is, I know nothing about UPS backups. What brand, size, etc. should I look for? I might also pick a small one up for my LED TV and receiver.