I just picked up Panasonic 1080 50" plasma this past weekend and I absolutely love it. I have my Comcast HD box hooked into it with HDMI. Picture is absolutely

Now my question is, Im running my 360 through Component cables, and the HDMI cable is almost 100 bucks in stores. The pictures looks great already, will I notice any difference by upgrading to HDMI on my 360? Will the quality affect the HD-DVD player for the 360 if I do decide to obtain one also in the future?