Need help! Choosing computer?

Talk to the technicians in a few local computer repair stores. They are more knowledgeable than the sales staff(after all, they got to fix the things). While they can't give you prices, they can give you an insight as to what you need for a machine. That is the route I would go. But really, the best gaming machines are the ones at the arcade which are solely dedicated to the game. A PC can't touch them in visual quality and sound quality.IMO