I have my entire computer power grid, monitors, boxes, networks, externals, etc. plugged into 4 6 outlet strips($7), which are then plugged into 2 Backups Office 500 UPS's. Iv had no problems and when power goes out I have about 15 min. of power to everything on the grid. I think the UPS's I have run about $50-75.
Theres really no need to get the high dollar when medium works.
To give you perspective of my home setup: (all running off 2 UPS with 15 min. of full up time after power failure)
5 boxes (NT x2,Win2k,XP,Win98)
1 Ext. Orb Drive & 1 Zip Drive
1 Network Hub
1 Desk Lamp
1 Table Lamp
1 Cable Modem
1 cant think of the name (Switches monitor, keyboard, mouse) from one computer to the next so you don't need as many monitors and keyboards and mouses as you would normally need.