Welcome TripleHeader 8)
I too considered buying three 22" panels, but that didn't seem like the smart thing to do. My own desk is sort of inside a closet, so I went for 3x 19" - this exact same model, the Viewsonic VX1940w. Very good response, nice image, high pixel density, there's even a built-in 4:3 mode for when the darn Flat Panel Scaling won't work... and there's enough room left for my 2.0 speakers. I really like these monitors. Only problem is the bezel thickness, since Bezel Management is somewhat broken at the moment. (I don't feel the need for a triple stand though, can't help you on that matter.)
Concerning the use of an additional 22" for "doing other things while gaming", well... don't forget SLI can't do that yet afaik. One output only !
On a sidenote, as long as your monitors have the same native resolution, you could mix the 22" with two side 19"... It sure wouldn't look perfect, but hey, that's one less VX1940w to buy and you'd keep the larger Samsung as main display :)
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