Amaranth grain
Eggs
Buckwheat
Hemp seed
Spirulina, but I don't think you can process this at home.

Also, combine within one or two days for complete protein:
Beans + grain
Beans + seeds
Beans + nuts

If you're using soy, make sure it is from an organic source; there are a lot of questions about genetically-modified (GM) soy, and about 85% of the soy grown in the U.S. is GM.

Sue