Found this on Giant's website:
(Here's the link: http://www.giant-bicycles.com/en-US/...en/1246/29289/).
Assuming this is the correct chart, based on my (non-expert) assessment of the top tube lengths, I would think that at 5'4" you would be choosing between a W-XS and a W-S (or a regular XS and a regular S). It looks like the bikes have a very big slope to the top-tube, so the seat-tube length (=nominal frame size) that "fits" you is going to be shorter than with a less compact frame.
A 54 cm top tube (which is what the W-M/50 cm frame has) seems biggish for someone your height, at least in the abstract. If you were looking at a bike with traditional geometry, on the other hand, a 50cm bike would likely have a 51/52 cm top tube (approximately), in the same range as the XS & S compact Giant frames...
Others who have experience with Giants may have more to offer though...
good luck!



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