One way to help make this decision is to figure your "dream stocking" - everything you would want wrt species, size, and numbers - and then get a cost (estimate) for it to compare with DNR's $50 tag. I am sure the difference between the two in cost will be much, much less than the cost of the pond.

"Live like you'll die tomorrow, but manage your grass like you'll live forever."
-S. M. Stirling
[Linked Image from i.pinimg.com]