I'd certainly appreciate being able to choose to d/l headers only while not on wifi - then d/l the whole email if I want to. That's what I've done on other devices. I seem to remember posting that I was a little surprised not to have that option in the email programme.

I've got used to it, and I've used less data than I expected (if the monitor is correct - if not I'm in for a shock when the bill arrives!)