The head tube length shouldn't really be on the list of considerations when choosing a frame size... pick the one with the best top tube length.

Using the seat tube length to size frames has always seemed a bit silly to me... effective horizontal top tube length should be the measure. Your seat's height is... you know, adjustable.

And you can put your bars wherever you like via an appropriately shaped stem, so the head tube length should only matter if you're shopping for a new fork.