My wife has an extra IBM thinkpad lap-top. It is a pentium III with a 40gb HD, DVD burner, etc. I was hoping to use this for a home theater pc of sorts. Next summer i am going to purchase a projector and would like to use the lap-top to play the movies. What upgrades do I need to consider. I need an audio card with digital out. Will I need a video card as well? What other options might I want to consider?