So i just went and bought a new Samsung LCD. It has a response time of 4ms and a game mode so im thinking great, this should be plenty fast for me. I bring it home hook up my 360 and now am experiencing noticeable lag in games. I'll list everything i have going so maybe one of you can spot something.

Hooked up with HDMI cable
Have fiberoptic cable for sound (thru that extra converter Msoft gives u)
sound goes directly to my sound system.
have 2nd xbox connected with component cables
I have it networked to my PC and stream w/ tversity every now and then. Has not been streaming while playing tho.
I have all the enhancments off
hmm idk i think thats about it.