For multiyear plots try several species of clover and a little alfalfa, yes they do eat the weeds about as much as your plants, but the legumes stay green when the weeds have dried up. If you get a good stand, you should not need to reseed for several years. For annual plots canola, turnips, vetch, barley, wheat and sunflowers work. If lots of deer are around, it is tough to get the plants started, they eat them as they come up and you think the seed did not grow. These are mostly cool season crops and are best for the PNW. If you are late, past the middle of May, try the shortest season corn you can find, less than 90 days. If you happen to get a little rain or the spot has good ground moisture and you get a decent population of corn plants they will get 5 or 6 feet tall, cover up the deer and every ear will be eaten. Most of the "deer mixes" are way over priced. You shouild be able to do this for less than $50/ acre seed cost.