Here's my old set-up; 2 x 30" + 1 x 24" (I now have 3 x 30")
To be honest, if you're good enough to make money playing that many tables then there's no reason not to purchase at least two 30" monitors. They pay for themselves.
http://bp2.blogger.com/_4PaNfrrYgQg/RnRq...er+Set+Up+1.JPG