2gBit line... Connected to... lets say you have the worlds most AMAZING cable, and go 10x what the average is.... 80mBit down and 5mbit upstream...

Bottleneck is your internet, not your nic.

A single 54G wireless connection is generally going to absolutely swamp what your average home broadband solution can handle.

Hell, the company I work for is having a 30mbit fiber ring turned on between our location and data center... but we'll STILL only have 4mbit to the internet.