My opinion for what it's worth
It's all personal preference and there isn't a right answer or a "truth"
That is quite clear from the ongoing discussion.
My own experience was coming from a 50" plasma / PS3 to a 27" 1080p / gaming PC really blew my mind. I have just bought three 23" screens for eyefinity and spent a little bit of time yesterday on just one of the screens. The difference between the 27" and the 23" is noticable. Graphics look a lot more crisp but they will do as it's the same pixel count in a smaller space. Some people prefer a larger screen for games - I now prefer the 23" over my old 27".
And..... I prefer Eyefinity over all of the above. (But I am aware that many people can't stand it!!) But it is my opinion
Eyefinity is brilliant for playing 3rd person games and things like WoW and stuff. I mainly used it in BF3 and it has a bit to go before it's great in FPS games. The sides just seem really stretched at some points instead of really broadening your scope IMO. I will probably pick up another two s23700d's for 3D Eyefinity when they're on special again.