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You aren't using the term Eyefinity properly when you say "Eyefinity works only if all the monitors are the in same orientation (portrait or landscape)."
SLS (making all monitors act like one large monitor) might not work with PLP but Eyefinity does. Just look at he AMD FAQ...
I was thinking it might be nice since I already have a 24" L to add some cheap/small P's to the setup.
My 24 is a 1920x1080 and I'd be willing to add most any P to the mix as long as the power draw is low, cost per scren is low, and then I'd have to figure out how to get them in portrait...
fwiw I got the gw2450 and I'm liking it way better than my old TN 22" it replaced.
I went from 1680*1050 to 1920*1080 so I gained on both the horizontal and vertical even if the vertical was only 30 pixels more.