Not to confuse you even more, but don't rule out 27.5 inch wheels either. A few companies--Jamis most readily comes to mind--are adding 650b wheels to their mtb mix. The marketing at least suggests that they might be a good compromise for shorter riders.
I, myself, have only ridden 26ers. While I've been curious about 29ers, for now, I'm happy with my 26er. My husband, however, loves his 29er. A others have suggested, just demo all that you can.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher