If you decide to go the 24" rout, I could highly recommend the Dell 2408WFP.
It is an excellent display with very full and accurate color reproduction, even when it is not calibrated.
I also use it for occasional gaming and have no complaints about it there either.
Great display, well worth the $$.
I have no experience with either of the 30" displays but I can say that there is no such thing as to big a display area
If your pockets are big enough, that is.
While the extra display area is sure to be awesome, not only will you have to shell out for two expensive displays, you will also have to have a fairly substantial system with multiple higher end GPU's to be able to properly game on it.
If it were me and I had the cash to burn, I would go with a pair of 30" displays.
My 0,02€