From what I've read here it may well depend on things other than just your height such as if you have short or long legs as well as the make of bike. I've heard that Marin Bikes for one run a bit big so a 17 may work on one of those where a 19 would be best on another make. Overall though it does sound like the 19 is going to be better but as others have mentioned give it a try. It would also be nice to be able to compare with maybe another model from the same maker; that is with a 19.

Now that you've measured yourself and found you're 6'0', don't forget!