I'm only 5'7, about 31" trouser... I have smaller hands than you for sure!
Okay guys, sorry for jumping around... but as the Desire Z and Desire HD are fairly new... I'm continuously evaluating them based on reviews and user opinion... and it seems as much as I want to come to a conclusion, it might not.
What I've read so far through TechRadar and same complaints seen else where on forums and what not is:
Desire HD: Everything is great, except battery life with 1250 mAh. And some have complaint about the battery door that after opening it a few times it starts getting flimsy and may open on its own over time
Desire Z: it seems like the Z design for the keyboard mechanism isn't as great as HTC claims it is. After some testing and even going to the store and playing with it, it seems like long term use it may wear the mechanism and eventually cause the phone to become wobbly. What I'm also afraid of is IF I were to drop it (which seems to happen to everyone sometime down the road), I'm scared that if it some how lands when the keyboard is somewhat open, it'll snap the hinge and basically split the phone.
At the moment I'm leaning closer to the Desire HD, however after reading some reviews it seems like a lot are pointing in the direction of the original Desire, concluding that with Froyo 2.2 the original Desire is just as good, and you can save some unnecessary cash by getting the Desire instead of the Desire HD if you don't care for the bigger screen.
I like the bigger screen of the Desire HD, but am concerned mainly about the battery door. I am hoping the next phone I buy will be in good shape for at least 2 years. I am buying these phones unlocked, so I will be paying for them in cash, so of course I want to get something where I can look back 2 years from now and be happy with.