Wifi Vs Mobile Access To Internet

I'm in the market for a notebook PC for work/play.

I saw to models that seemed to have the exact same specs but had different prices. Perplexed, I finally asked a salesman what the difference was. He said one was only compatible with the A and G WiFi speeds, while the other could use the N standard, which was multiples faster.

I learned that the newer (but non-Centrino 2) models have an Intel WiFi