It looks like the NSA hand-and-a-half is right for you.
I don't really consider that armit thing a hard and fast rule. Longswords were made in many different lengths. I think getting a good quality waster is far more important than any "ideal" length. And the NSA waster is about as good as manufactured wasters go. At least in my experience. I have not handled the New Raven longswords.
Seriously, I think length is more of a personal preference. Either of the hand and a half lenghts that NSA makes should suit you well. I have the longer but constantly have buyers remorse. Perhaps it is good to be familiar and comfortable with either. Also, most of the longswords Albion makes seem to be in the 36 in blade range. Perhaps I give that more weight than I should but they are based on historical samplings.