a few reasons i suggested both as an alternative.
1. he would like to put the car into the low 11's someday requiring the roll bar
2. along with additional chassis stiffness a good set of subframes can provide mounting or an easy cross member install to get the torque arm off the transmission and get the transmission off the flimsy stamped factory mount.
3. a stiffer chassis is easier to tune the suspension for a consistant launch.
4. the stiffer chassis will reduce the wallow often associated with lower rate springs + race shocks(especially 90/10's in front) on the street.
the biggest thing is that i see as a benefit for someone in matt's position is that the stiffer the chassis, teh longer it will last under street/strip use. anyone who has been around racing a while can tell you how a chassis gets used up over time. a street car is no different, and since this is matt's first project we can all be sure that he will want it to last a long time.
just my $.02 on the topic