A decent cable, up to about 50 feet is fine. I would go with
http://www.bluejeanscable.com - not the best prices, but some of the most well made cables out there, and solid customer service if you have an issue.
I would NOT Y them. Didn't even know there was a Y-adapter for them for that matter. The tolerance is simply to tight. You can manually switch them if you want, or just pick one to be run over component.
Of course, there's always my favorite question...
Why even put your components at the front of the room? Your projector is at the BACK of the room?
Just something I ask as I try to get components out of the line of site as their blinking lights and LED readouts are distracting to the movie watching experience IMO.