I would caution you to try out any bars and/or bar ends with the fold before committing. I have the bike friday break apart H bars, and they do interfere a bit with the folded package (making it a little wider and harder to fit in places). Moustache bars or big bar ends could get in the way of optimal folding.

as for the IGH, i hughly recommend, especially the Shimano Alfine! I absolutely LOVE mine!