Sidestepping to the town (commercial):
Labourer
Apprentice
Master/Guildsman
Merchant
It suddenly dawned on me that the intermediate guild ranking was missing: Apprentice,
Journeyman, Master. The vast majority of guildsmen would have the Journeyman rank - they would be capable of independent, solid work.
Town (political):
Bailiff
Sherriff
Councillor
Reeve
Justiciar: the chief political and legal officer from the time of William I to that of Henry III, who deputized for the king in his absence and presided over the kings' courts. I didn't have a precise definition to give a ranking, and this was the one that popped up first on a search. This then was something of a "federal" position rather than local (town), but shows a progression up the legal side. But then, a justiciar would probably be a noble, so perhaps it doesn't truly fit.
I probably wouldn't have bothered mentioning the justiciar, but while researching that, I found the answer to my own question about the difference between Reeve and Sherriff (Shire Reeve). The Shire Reeve served the larger unit (the Shire as opposed to 100 families) and was thus higher up the scale. A Bailiff was orginally commander of the night watch and had no special training, and would probably rank under a Reeve, who held the power of both police and judge. So doing a bit of re-ranking:
Bailiff
Reeve
Councillor
Sheriff (Shire Reeve)
Justiciar
Though, honestly, I'm not exactly sure where Councillor fits, but it would seem that a Sheriff was a more powerful position.