In reply to broken spectre:
The '70cm' thing comes from the old-fashioned advice that the 'optimum' length is that in which the spike just touches the (flat) ground when you're holding the pick end in your hand. My opinion: if you want a walking stick, get one - but that's not what an ice axe is for.
This has all been discussed here many times before, so a read of the above-mentioned thread, as well as a search of the Forums, might help.
For what it's worth, I wouldn't want anything over 50cm.