I agree, processed feeds (including pelleted feeds) and "Sweet feeds" add "junk" to a horse's diet.
I use pelleted alfalfa because it's almost impossible to find alfalfa hay here in Arkansas. I feed free choice mixed grass hay (Bermuda with local grasses), alfalfa pellets, a vit/min supplement, and flax meal. It's a very natural, healthy diet.
In your area, for a 1000 lb horse, I would feed 10 lbs of alfalfa hay (about 2 flakes) a day with 15 lbs of Bermuda or Orchard grass a day (about 4-5 flakes). For "grain", I would use plain oats or any kind of hay pellets (1-3 lbs of either one) mixed with a good vit/min supplement and 1/2 - 1 cup of flax meal.
Horsetech.com has great supplements, including one called High Point that is a good all-in-on vit/min supplement in a flax base. If you want to feed extra flax, they have a plain product called NutraFlax, or they will add more Flax meal to the High Point supplement for you. They do custom blends for no extra cost, just the price of the added ingredient.
Uckele Equine also has a good vit/min supplement called Equi-Base (Grass or Alfalfa) and they do custom blends too.