New Monitor

Hello all, I am looking for a 22 to 23 " lcd for my PC. I relly dont know much about them other then 2ms is better then 5 ms. ATM i am useing a 260 VC but might do xfire 4890s latter less its a waste on the size monitor. Corsair said my HX620 would haddle the xfire setup, but others have said i would need atleast a 750 so i dont know any help is welcomed. Thanks
 
a acer 22" monitor i bought it. I guess the question is if at a later time when games get more demanding and my evga 260 dont cut it anymore, would my HX 620 handle a xfire setup. Or maybe it would be better to just get a better single card