If you want a good computer for a good price, you might as well forget big brands. Acer, Asus, HP, Tosh - they'll all rinse your wallet for more than you'd like.
I second the recommendation for Desktops over Laptops. But, if you really want a laptop, definately check out Sager. From what i hear they really kick the big brandses asses.
custom gaming laptops - Welcome to Sager Notebooks
There are plenty of custom desktop builders in the states, im sure someone will be able to supply you with names.