I know this is a stupid question nut hopefully someone can enlighten me. Well, i recently purchase an xbox hoping to modify the sucka. Since I am very new at this i would like to get some information. I have been searching through the internet for the right modchip, but im all confused because thier are so many to choose from. My plan is to modify my XBOX to where it can play MP3, DIVX, DVD, and of course BACKUPs (I DONNOT HAVE A CLUE ON HOW TO BACK UP GAMES). I hear a lot of people have accomplish replacing XBOX with 120GB HD. Can someone tell what the process/tools required to achieved my goals stated above?

I very computer literate and have done some PS1 mods (all models).