both lotro and AoC would run better on the 22", most older mmorpgs will run fine on the bigger screens with the 8800gtx. Im pretty sure I ran WoW at 2048x1536 on a single 8800gtx when I was playing it.
Its worth noting that you will get a better image quality out of a 20" panel than 22" or 24" from the same range, due to smaller pixels \ higher pixel density. Smaller pixels reduces the need for AA.
Some people suggest sitting further away to blur away the effects of the larger pixels which of course reduces the effective screen size as well... By the same token why bother paying out for a bigger monitor when you can just sit closer to the smaller monitor to get the same effect
I set up a workarea for good ergonomics and comfort, and get my original image looking as good as possible.
Personally I prefer to get the native image as beautifull as possible and set up my seating and desk area for good ergonomics...