getting a bridge will not solve the problem .
The firmware of the 360 ethernet module needs to be updated as it is tied to both wired and wireless
So by leaving router set to auto and using a wired connection will still slow you down .
My buddy is hard wired and speeds only increased AFTER he changed router to b/g .It was set to auto .
There is no setting to change on the 360 its either wired or wireless . Unless you change router no speed increase will happen .
So a faster bridge will do nothing unless router is set to b/g only .Have no idea why but thats the way it is .