dude you are getting way to involved. Go buy a webstar cable modem or a dsl and start playing. Brand does not matter. I play lots of MW2 on 360 with a cheapy 30 dollar modem.
a 1987-1993 ford mustang GT or LX. Make sure you get the 5.0!!! Also make sure it has not been molested. Go for as stock as possible. Car will last your at least 250k before a rebuild. Extremly reliable. I own a 1988 LX 5.0.