If I understand you correctly, you basically want to occasionally use your PCs in a different room with a larger screen. I'd go for the "larger monitor" option, or even a TV if you want to go very big. As for the "computer" element, another suggestion: depending on your setup/where the room is, you get a netbook/laptop/small PC with wireless (or if you have a server you could use Cat5) and use remote viewing software to control your PCs from the room. That way everyone can just their own computer (without moving it) in the room. Hardest bit would be training everyone on using the remote viewing software.