I'm more of a beginner/intermediate.
Only problem is I have my bindings mounted and it'd be a pain to have to return for a 153 especially because I like the color of the 156.
Only 8 screws to remove your bindings, and I hate to say this but if you're more worried about colour than how it performs you might be wasting your time asking the question!
To answer your first question again: Yes a 156 sounds too big for you, it will likely be easier to learn on a board designed for your weight.
Hope this helps!