I am 5'6 and mine is AP. I think that is a good all around armor that can be sized down fairly easily.
You can also look into a Scout. That is what I started with. It can be sized down for us smaller folks without much in the way of trimming. Plus, we can sit, move and see, so you got that going for you, which is nice.
And don't worry about the short jokes, I hear even tall troopers get that line.