I don't know how many cals that works out to, but it sounds better than 500! I still don't think I'd be able to eat the same thing every day... mabe for one meal, but not overall. I just really don't think you can get enough variety to get all of the nutrients your body needs. Vitamin supliments are great, but your body is ment to derive its nutrients through whole foods, not pills.
Just my humble opinion.
Good luck in all of your nutritional endevors