If you're in need of guidance, start with the stickies on this forum. Proximon has a great guide on how to choose parts and in his sig, he keeps a list of parts he recommends to get real specific. Once you have gone through that, you can use the sticky on how to ask for help to get some specific help based on a budget and what you have already. That link is also in my sig. Follow the format, and you'll get lots of good help from the knowledgable around here.