cire9 - The other thing to consider doing in a small pond like yours is adding only single sex fish or non reproducing fish. Purely put and take system. Add what is needed to maintain balance. Once you introduce pairs of any fish species over abundance can easily occur; as experienced by Brian L.
Cecil and I have used single sex bgill and perch with excellent results in smaller ponds. Cecil female only perch and me only male bgill. Cecil is now working with male only bgill. These fish get big pretty fast primarily due to lack of competition from abundant siblings and very short times away from feeding due to spawning. This way you get diveristy and not the headaches from over-abundance.
My main concern in your case is the stream that feeds your pond. Streams can provide numerous unwanted fish to the fishery. Ultimately bass may be needed to police the immigrant fish.
PS SMbass can easily tolerate your water temps and should not be a concern for your situation. From my experience the jumbo perch will be the first ones to show temp stress.
