^^^ I'll agree with that, mostly, including the low rating (I would say "optimistic"; conservative to me would be a much higher power unit).
Note I said to check the ratings for his gear. He seemed concerned about finances and for myself I do not normally run the equipment on the UPS; all I want is a few minutes to give me time to turn things off. More conservative would be what I first said -- add up all the numbers on the labels then get a unit that provides a good 5 minutes (or more) run time. And my caveat was for the projector, which needs to run longer (albeit at lower power) to save the bulb. BUT, I agree he needs to check the equipment. Frankly I did not know a PS3 would try 200 W, that's a bit of power. Not really surprised, just hadn't thought about it. I would have said 350 VA is optimistic, not conservative, but semantics vary.
I routinely buy larger than needed so I forgot about the alarm/overcurrent feature. That is an excellent point: a UPS that does not handle the operating load even briefly will likely alarm and shut down immediately. It is not a good thing to happen.
Personally most of the units I have around the house are rated at 2x the power of their total max load. The exceptions are a couple of media systems, where I tend to derate the AVR (only -- everything else per label) since I rarely run it at max power or anywhere close, but with that derating the UPS are still ~2x the load. The smallest I have is actually a 250 VA model on a laptop and monitor; all the rest are 750 - 1500 VA units.
I have read mixed reviews on various sites and in journals about point-of-use surge protection after a whole-house solution (which I already have as stated earlier). For now I use mainly UPS' on electronic gear and nothing on the rest. Most of the inexpensive (and some very expensive) surge protectors use devices that will not survive more than a few significant events, and do not last all that long with smaller events. A number of commercial units recommend you replace them yearly. That's a lot of money in surge protectors, so I am getting by with my UPS units. I have a few surge strips but they are more because I needed the outlets than that I expect long-lasting surge protection from them.
As long as we are talking about these things I should note Back-UPS (and virtually all the inexpensive UPS units you will find at most stores) do not provide a very clean output when running on battery. They depend upon your equipment to filter out noise. For my application that is fine since I am only using them to protect things during a short glitch or give me time to shut down cleanly. At work we use SmartUPS on test equipment. They provide much cleaner output but cost much more. The only place I have a SmartUPS at home is on the aquarium. The coarse approximation ("noisy") output of a BackUPS can cause things like aquarium pumps and motors to overheat if used long term. The aquarium air and filter pumps I do need to keep running through a longer outage, so I have a 1500 VA SmartUPS for about a 150 W load, less when I kill the lights.
Finally, batteries and UPS lifetime are things I wince about. At home or at work (our engineering lab has point of use UPS' so we can wheel equipment around, plus a huge array to power several of our labs) the batteries often last only 2 - 3 years, replacements can be most of the cost of a new UPS (on sale), and we have several times replaced the battery in an expensive unit only to have something else fail a short time later. The batteries are usually lead-acid types so you have to take special care in their disposal. Of course I am a little more sensitized lately since, after paying for a college semester, two unexpected (and large) vehicle repairs, new tires for one of them, doggie surgery and following infection, and having my Oppo die
a power outage a couple of days ago revealed two dead or nearly-dead UPS batteries in 750 VA and 1500 VA units, arrrgh!