I added a few. Im not voting yet as I want to see if custom PC is a valid choice. But ive noticed that you have put some of the big computer makers. Alienware, Falcon NW, and VoodooPC. You not have heard of them, but thats because they dont need to advertise. If your into PCs enough you just know whos who. If custom isnt an option il go with Falcon as they kill Dells support (and dont really need it). They are good with mid level prices, mobile desktops (not laptops, but really small powerful PCs), and laptops. Falcon has laptops but if have to go with Alienware or VoodooPC on those. All three companies are really close. A smaller company called Velocity Micro is close behind too. Il add that too for the heck of it.
PS: If you wana see some falcon stuff go
here.
If you want to see VoodooPC go
here.