Normal driving, I shift at 3500 for each gear, so that I'm already in the low end of the powerband, and not 'waiting' to get into the powerband from a low RPM shift.
Spirited driving, 5-6000 RPM, with the occsaional redline hit if I'm really annoyed.
If you're ever shifting and putting yourself at less than 2000RPM after shifting, you're missing the powerband and just acting like an auto, grinding up to speed at a low RPM..