4PC with 4 monitors, for sure. That's 16 monitors! (Oh, but you probably meant 1 monitor per PC x 4.... 1 PC with 4 monitors is usually plenty and easy to do... especially if your mobo does not have "onboard video".)
how about 2pc with 2 monitors each? multiple pc issues: 1. software license -- you will need to buy a license for each computer 2. multiple keyboard/mouse -- You can use a switch, it is an extra key stroke, or a push of a button. (milliseconds counts!) 3. space for the computer -- where do you put 4 computers? and all the cables !!! 2nd pc gives you the peace of mind that if one fails, you still have a back up.
Agree, 2 x Dual Monitors. One for real time analysis software, One for trading and watching news/websites/anyother BS...