I have a number of the CyberPower CPxxxPFCLCD (where xxx 1000, 1500, etc., depending on VA rating). They are nice, quality units, have sine wave output, and are typically cheaper than the sine wave APCs. I use one for my JVC DLA RS1000. I also have a number of APC Smart-UPS UPSs with network management cards, so I can control them via network, but those are generally overkill for home t heater. I use the APCs for my computers, but I use one in my home theater rack.
I've had my eye on the Panamax MB1500 (and the analogous Furman unit) for a while though. I like its sine wave output and the ability to control it and get info via RS232 (and optionally via network). Another nice feature is that you can teach it remote commands, so it can turn off your projector automatically if there is a power outage. Only negative is its price.