How about 3 bluegill at 8",(2 female), 4-5 yellow perch @ 6"+, 6-8 Large(5-6") golden shiners, 3 cutlip minnows at 8", and 3 bullheads (any) @ 6", and 1 full grown mudpuppy. All are I believe local to you and would give you a nice interesting mix while leaving some grow out space. The shiners and cutlips should be available cheap in bait shops which might also carry mudpuppies