we use older 2200 models at the computer shop i work at for our servers, they seem to do ok. Make sure you have plenty of power though on the circuit they're plugged into, we tried to use them on our mobile gaming tournament, that didn't work too well. We only had 2 15 amp circuits for about 15 computers most of which were using crt monitors. Needless to say we didn't do much gaming.
APC has many other models that are more powerful, that one may serve your needs, but if not they definitely make high quality items... Even their lowest UPS (around $40 USD) had a 3-year warranty on it!