I feed these flavors:

ocean whitefish and tuna feast
cod, sole, and shrimp feast
savory salmon feast

Partially because they come in a 3 variety pack, and partly because they like these flavors in particular. Some of the others they just lick the gravy off of. There's a pretty detailed food chart and they have a good # of calories derived from protein. I look at the cans and try to get protein of 13% or better. Since the cans are smaller we can feed a whole can. We feed cans 4-5 times per day (2 in the am, 2-3 pm). My husband leaves for work a few hours before I do, and I stay up late & give the last food of the day, to give you an idea of how it goes.

http://www.geocities.com/jmpeerson/canfood.html

It may not be the cheapest of the canned foods, but it is cheaper than a lot of others.