I would look for one that would run your system for about 10 minutes to give you time to close out any files that you have open and gracefully shut down in case of a power outage. Just don't put your laserjet printer on the same line. Your monitor and computer should be all that is necessary.
APC Smart-UPS 1500VA LCD 120V should be more than sufficient. Many are cheaper but you gets what you pay for. Some of the cheaper ones are nothing but a surge supressor.
Computer type Laptop System Manufacturer/Model Number Toshiba Laptop Qosimo X870 OS Windows 7 Pro x64 SP1 CPU Intel Core I7 Motherboard Toshiba Memory 16 Gigs Graphics Card NVIDIA GeForce GTX 670M Monitor(s) Displays 17.7" laptop Screen Resolution 1600 x 900
Hard Drives 256 Gig SanDisk SSD for C
256 Gig Intel SSD for D Internet Speed 50/25 FIOS Antivirus Vipre (all you can eat for 10 machines) Browser IE and FF Other Info I have dos 6.22, wfwg 3.11, win98, 2000 and xp VHD's available for testing. MS's Virtual PC works great.
System Manufacturer/Model Number Self-Built in July 2009 OS Windows 7 Ultimate x64 CPU Intel Q9550 2.83Ghz OC'd to 3.40Ghz Motherboard Gigabyte GA-EP45-UD3R rev. 1.1, F12 BIOS Memory 8GB G.Skill PI DDR2-800, 4-4-4-12 timings Graphics Card EVGA 1280MB Nvidia GeForce GTX570 Sound Card Realtek ALC899A 8 channel onboard audio Monitor(s) Displays 23" Acer x233H Screen Resolution 1920x1080
Keyboard ABS M1 Mechanical Mouse Logitech G9 Laser Mouse PSU Corsair 620HX modular Case Antec P182 Cooling stock Hard Drives Intel X25-M 80GB Gen 2 SSD
Western Digital 1TB Caviar Black, 32MB cache. WD1001FALS Internet Speed 15/2 cable modem Other Info Windows and Linux enthusiast. Logitech G35 Headset.