They were looking for speed, a big hard drive, and a good gaming computer. When looking at the notebooks Lisa says, "Lets go see the Macs. They are kinda popular at this age. Ohhh, these are way more money dude!" "It's a little too small. Maybe we'd rather go PC.", says Jackson.
They end up purchasing a Sony VAIO with a 16.4 inch screen and Blu-ray.