Were you using firewall software on your computer? If not then maybe you were letting in a bunch of traffic that the router's internal firewall has now put a stop to. Can't think of another reason why a router would speed things up really.
You'd buy a $500 computer for a $1000 piece of software? The greatest thing about this is it could actually happen. The specs are pretty consistent with the $799 eMac, and Apple has always overpriced monitors.