yeah but I have the choice of 3 24" monitors for eyefinity or 2 27" for dual monitor
Get 3x 24". If you end up not enjoying eyefinity, you can still enjoy the desktop space.
Besides, if you get monitors that can do portrait mode, you can go portrait eyefinity and do 3240x1920 for 1080p monitors and 3600x1920 for 1920x1200 monitors. That plus bezel compensation.