Im gonna be out of the group here; but i wouldnt use anything other than my 120 fps lcd (or a crt) even if someone payed me 200 bucks to only use their 30". People say its not noticable; but one time my monitor decided to only be at 60 fps and it felt HORRIBLE; like i seriously wouldnt play first person shooters anymore if i was stuck at 60fps... Hell; id pay for my old ass dell 19" 1280x1024 @ 76 fps vs being forced to game on a 30".
It really comes down to preference i think... if you can see the difference and it doesnt matter to you; get something with a higher resolution; if it bothers u stick with high fps
At 22", you will love it for a couple months, and then wish you got the 24. I went through this same thing last year
My friend got a 24 and loved it for a couple months till he saw my 22, and then he wished he got the 22
*edit* i remember reading somewhere they are designing a 120fps 1920x1280 for dual link dvi... that resolution completely maxes out a dual link dvi...
Also im suprised no one has mentioned movies are at 24fps and don't scale to 60 Hz properly. However, they scale perfectly to 120 Hz. This is why movies look so much smoother on a 120 Hz set versus a 60 Hz set. The 3:2 pulldown just messes things up on 60 Hz sets.
Either way i think you should probably go to a B&M and check it out for yourself so you can see if u need more than 60 or not; some people just cant see it... My grandma cant tell a difference