The essence of what you're asking is "What's the best computer setup running a dual core processor for the least amount of money?". First, this is a personal quesiton, because the decision between laptop and desktop is a very personal one. Second, its a research question, not something we can pull off the top of our heads.
Then do the damn search for it. We're not google, nor are we your google monkeys. Anyone who got through grade school should be able to go to Google.com or newegg.com or Tigerdirect.com or microcenter.com and do some damn research.