What are the best compatible parts?

Ok, I'm a complete noob when it comes to PC. I want to make the switch over to PC, but I have no clue what I'm doing. I was looking into the Cyberpower Blackpearl when someone said you can build a better one for less money(My budget is around $1000). So I'm looking for any expert on this topic, some one who can tell to all of the necessary parts I need for a high-end build it yourself computer, one that can preferably run games such as Battlefield 3 on high to ultra settings.

Also, any software programs that would help me run the games themselves would be greatly appreciated. And please include the mouse, speakers, Laptop Keyboard and preferred monitor.