I guess it all really depends on how close you are sitting to the screen. A 22-25" screen works great for alot of PC players in large part thanks to sitting only a few feet away from the screen. If you intend on playing your PS3 close, or in a dim-lit room, or in a generally small game room, then I would think that a 25" widescreen monitor would be just fine (esp since you could always take your console to the bigger tv for a better experience on games that you'd demand that with!). If you are going to be sitting 6-8 feet away.. not so sure!
I currently run dual 25" Hanns-G monitors for my PC. They have HDMI input and are more than capable of producing deep and vibrant colors. I found the monitors for only $160 each off of New Egg. I have thought to myself more than once that I wouldn't mind another monitor this size for a 2nd xbox when the fam is using the 47" LCD in the living room... but then I just get stuck on the internet posting stuff in forums ha.. Either way.. I would think that the size is just fine, but then I grew up with only a 27" tv in my parent's living room, so a 25" seems pretty standard still -_-
