Just to give you an idea.... I'm the same height and I couldn't fit a 56. To long for me. You really need to try one out if possible. I didn't get the LHT because of this... I wanted to run 700C wheels and it's not an option in the 54 that fit.
That being said.. some people love 26" wheels.
YMMV because of body dimensions and saddle to bar drop preference.
kyakdiver