If I'm driving hard and want good response: Step 1 is BEING IN THE RIGHT GEAR! You don't need power at 2000rpm, you should have already downshifted two gears and getting it into the peak power band of the engine/turbo setup.
So for me, response isn't about RPM, it's how long the turbo it takes to come onto full boost when I stomp the loud pedal and I'm already at 5000rpm.
A decent power curve is nice below there, makes everything nicer on the street. But don't expect to make balls to the wall power AND have all the power down low in a turbo car, or it'll run out up of go after you get above the midrange (which is where you'll be if you want to go fast)
I'm talking about manuals of course, because fk autos