As usual with these types of questions, not enough background information is given. One key thing is something Manuel touched on; will the computer be used for things other than recording? If not, and given your apparent novice experience in recording, I think he may be correct in that an 'all-in-one' box like the Zoom R16 would be a great starting point and likely yield the quickest 'good' results. It's definitely the cheapest way to get started. Don't forget Gary's good advice on the Mic's. Get a large condenser for vocals. Do some serious research (study) on home recording before you start spending wildly (most of us like to buy first, and learn later, not a good idea).

chas