
Welcome on board mate.
There are plenty of folk out there who are a lot shorter than you who get on fine with a standard height Z.
IMHO buy a full height one and see how you get on. You'll be surprised how quickly you adapt and it won't feel weird after a few hundred miles. Plus, the stock suspension settles and sags quite quickly.
If you find you can't manage, then you can always lower it later quite cheaply. It's a lot easier (and cheaper) to lower one than it is to raise one of the ABS low models!