Rowly,
With a pond that big and the fact that yellow perch, largemouth bass, smallmouth bass and in many cases some bluegill have to be feed trained when they are very small concentrating them in tanks, I would save your money.
This is coming from someone that feeds feed trained largemouth bass, smallmouth bass, bluegill, and female only yellow perch everyday, but I have a smaller pond (one of my ponds,)and it is less expensive, and easier to have many of the fish in the pond rally at the same feeding spot twice a day.
With a pond that size you shouldn't have to feed them, and it would be difficult if not impossible to feed them all let alone expensive. You'd also be adding lots of nutrients which can also cause other problems.
