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After having enough RAM, extending your screen real estate is probably the best productivity enhancement you can do. Apple has supported dual displays on Macs since the late 1980s and nowadays even Windows can do it.

I have used dual displays with some of my older setups but that was some time back. The prices on flat panel displays are very low now so there are really no reason not to get one.

I recently bought a 19” HP LP1965 display that cost me around €250. I picked this modell because it got decent reviews and had a number of features I was looking for.