Is 2gig to 3gig  of ram noticable? + do extra displays require more ram?

hey guys
first question.... i have two gigs of ram in my mac right now.. i use photoshop and handel large raw files, would i notice any differnce if i were to upgrade to .. say 4 gig? or even 3?
second question... i have my 23" display and then i have another 19". would the computer run fast/more securely/smoother without it? in other words, does an evter display take up more ram?
thanks alott

You probably want 8GB of RAM as a start.
A fast boot drive, another fast scratch drive, and data drive, just to get started.
http://homepage.mac.com/boots911/.Public/PhotoshopAccelerationBasics2.4W.pdf

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