Have Dell 2001 FS, want 2nd monitor to go with it.

[Witzo]

I have a Dell 2001fs and want to add a 2nd monitor so I can play more then 4 tables comfortably. Am I better off getting a 2nd Dell of the same model off ebay where thats the only place I can find one, or should I go with a different brand ( I see people mention the Samsung 204b).
I have the capacity to dual monitor so thats not an issue, I just want to make sure the two will look correctly side by side, especially when I'm using the computer to game or watch a movie and not poker'ing.