With the implementation of the horse combat there could be a few new 'classes' per say.
1). Ranger- always on a horse when able, and uses bow combat when he is. Fast and lethal.
Put most perks into archery and enchanting to make better weaponry and enchantments, wont really need to rely on armor since you will rarely be hit on horseback.
What do you guys think?
I've always seen ranger characters as foot mounted characters. And if I were you I would focus on the following skills, in order: One-handed, Archery, Sneak, Block, with alittle Alchemy for health/stamina potions, as rangers tend to live off the land. Sneak up on your enemies, pick a few off with your bow, then rush in with a one handed sword (no sheild). Fast, nimble, and agile. Take them out as quick as possible. I would stay away from all types of magic, as rangers are warriors not mages. But I hate magic so that may not be as appealing to to you as it is to me. I think a ranger would be best suited in light armors.