'01 is in fact the real deal - all these '02 and newer folks are wannabes..
Find a good condition Speedway White '01 and be happy.
You want even notice the 20hp difference. Especially if you are going to modify the car.
The clutch, transmission, electrical and quality issues can and do haunt any year Z06 - it is just a crap shoot and luck of the draw whether you get a Chevy that has issues...
The only problem you side step with an '02 or newer is oil consumption.