If you are 5"7' then any of the screen derived armours (ATA, AP, CFO, RS and so on) or TM should fit you just fine with some minor modifications. Some say that AP is the smaller of those I mentioned. I'm about 5"10 and really slim and wear my TM just fine height-wise. For girth I needed some extra trimming for get a good fit.
DO NOT get AM despite it's low prize (on par with ATA), you'll be swimming inside it without extensive modding and then you'll want to get a new helmet because the AM helmet is not much to look at.