Yeah you are kind of new so I hope the moderators let you slide on the "downloaded movies" thing. Read the "Forum Rules" sticky and don't do it again.
Secondly, about the Matrix Infinity, I would also like to point out that the Crystal Chip is also a good option. If you do decide to go the HD Loader route, the Bootmanager for the Crystal Chip is nice for loading HD.
Take a couple of days, read all the stickies and posts (they should answer like 98% of your questions), and come back when you have specific questions. Also, a lot of the posts mention some good installers and chip websites. Try doing a keyword seach for your more specific answers to your questions.