Good power to weight ratio. 200 HP per ton of car would be a good starting point.
18 MPG or better overall
Good front seats
Rear wheel drive or AWD with a rear bias
Good sound system
dual mode exahust like on the newer corvettes and Boss Mustangs
4 pot brakes up front , 2 pots in the rear (or better)
fully defeatable traction/stability control
power windows/locks/seat
full instrumentation
a hood with gas struts rather a prop rod
timing chain
remote start
manual transmission
limited slip diff