Battery backup

[Nomad84]

About a week ago, I briefly lost power at my apartment 5 times in the same day. It hasn't happened any other time, and I wasn't playing poker, but it occured to me that this could be very expensive if I was playing. Also, I obviously prefer not to lose power anyway when my computer is running. The potential financial costs of a power outage got me thinking about battery backup power supplies. I plan to buy one soon, but I have no idea what to look for. I need to be able to power an Athlon X2 3800 based computer with 2 hard drives, 2 CRTs, cable modem, and router. I would prefer to be able to have power for long enough for the blinds to come around, but if that isn't possible, at least long enough to finish the current hands. I will probably be adding 2 LCDs in the future, but if I continue to run the CRTs also, then I'll probably just have lobbies, PT, etc. on them, so I probably won't have to run them all at once. I will need a minimum of two displays though. Obviously, speakers are low priority.

What should I look for in a UPS to meet these needs? About how much should I be expecting to spend? Thanks!