[quote=@Dark Cloud]
I was thinking like Ogre sized, like 8ft to 9¼ft tall. Barrel chested, broad shouldered.
[/quote]

Eight feet is probably the max that I'd allow. Perhaps temporary increases beyond that using magic? In most open-aired battles it wouldn't matter, but being any bigger all the time would make it rather difficult to actually enter towns. Plus, at a certain point size increases add a huge increase to strength as well. Multiple dedicated Talents or a Specialization would probably allow your character to encompass very large sizes.