Actually the Mini Cooper S has a better power to weight ratio than the 500. The Mini Cooper S weighs in at 2668 lbs with the six speed manual. The Cooper also makes 181 HP and 177 ft lbs. The 500 makes 160 hp and 170 ft lbs and weighs in at 2533 lbs. The Cooper S does cost $1,100 more than 500.
A coworker of mine went to DC court this morning to fight his speed camera ticket and he said he got out of it using the "unable to identify the driver" defense.
Arlington is split between urban and suburban. If you live along the metro line anywhere from Ballston to Rosslyn it's definitely urban. Anywhere else is just a packed suburb without parking spots.