MIP Monitors

Hey guys so iv been looking at all kinds of aircraft and i think my top 3 are the 737, Dash 8, and the CRJ-700
which one would be the simplest to build with the limited amount of money that i have, but i dont want to sacrifice realism looks wise.
I have a 20 inch HP Monitor and hoping to get another identical one soon would that be a good thing to use for my pfd ?? on the captain and co-pilot panels..... there really nice and my computer is an HP 1tb 2011 computer so basically brand new
Would i be able to run 3 monitors and a projector on one computer also with a lot of saitek panels because thats the only thing i use that computer for so its free of space and speed
All of your comments are needed and Appreciated

Thanks Jesse