Whats the advantage of installing it to the Hard Disk then ? I'll need to change mine as I only have 10 gig spare, if that !

I have one of the 1st 360's so no HDMI etc. I have considered selling it and buying a newer one now they are all HDMI and coem with a larger HD, is it worth it or not ? I suspect the graphics will improve going over to HDMI ?