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@hugo7
I'd tend to go smaller as imo if there's not much in it enlarging a frame is easier than shrinking it.
Also (you don't have to answer here btw), if you're being really honest, is there a part of you that just doesn't want to buy the 'really small bike'? If so, it's not really a sensible reason.
This link: http://www.mediafire.com/?5xnxnyynzih
is to a excel file download for a bike fit calculator. Get a friend to help measure you, enter the details and then compare with the geometry table of the langster.
Base your decision on that. Rather than our guess work - we can't see you :)
It is highly likely that you will have to change the stem. If you're using drops then some compact bars might be a good idea given your height. The bottom of the range FSA ones are cheap and work well enough for me.
Also I'd consider the alu langster (for lots of reasons), but mainly in your case, because it's got compact geometry, so the standover height will be easier and it should give you slightly more range.
EDIT: the new one doesn't really look compact geo; and the top tube measurements on the steel are:
49 = ~52mm
52 = ~54mm
If you have stopped growing, and don't want to check for yourself on the bikefit calc, then buy the 49cm one.