If I was 6'5" or better, I might want a taller tank, but 24" is plenty deep for me. Of course, it also depends on how high up off the floor the tank sits. Mine from top rim to floor hits me just about my armpit. I would not want anything any taller. Also, a 29" or taller tank just about requires 400W lights if you want to ever be able to grow anything.
Stephen