Tripe lite over APC all day long
the mentioned Cyberpower is great
 
make sure you buy based on wattage NOT VA rating

Thanks Scott.
 
Too late I'm afraid, I ordered the APC a few days ago, it arrived yesterday and I'm pleased to report it is completely silent.
 
APC Back-UPS Pro 1200 - UPS - 720 Watt - 1200 VA.
 
This should have enough grunt to power my entire studio, if not, I have several wall sockets to power less critical devices

720W is very low. whats the power supply in your computer? monitors are like 50W each plus gear

I have an 850W (I know I need to upgrade and its in future planned upgrades) and it will get me by for 3 minutes and then long enough for the PC to do an orderly shutdown, along with the momentary glitches.
 
I have my PC, monitor (screen), Octa-Capture, Headset distribution amp, BCF2000 and cable modem (has voice telephone connection) on UPS.  I've never done any power amperage measurements to see what it all actually draws.

As long as I can power my computer, interface & monitors I'll be ok.
 
From memory, the psu in my computer is quite modestly rated - about 350W I think

I've been using an APC (for computer and 3 lcd monitors) and 3 Tripplite Voltage Regulators for the rest of my system.  They don't really create any noise except a rare click if a voltage regulator switches when there is a voltage drop and then of course the beep from the APC when the power goes out.  This seems to protect everything and it buy's plenty of time to do a proper shut down if the power goes out.