For gtx580 sli - should i buy 24' 1920x1080 or 22' 1680x1024?

with 1680 I'll get more fps (with settings maxed out)

with 1920 - less fps (with few settings turned off)?|||Get the 24" @ 1080. You'll have more resolution options available (1024, 1050 and 1080) allowing you to optimize image framerates.