I've had a 150 gallon native tank for over 25 years.
Here's my advice -
Absolutely stay away from gamefish. Bass & walleye sound great but they're
a pain. And they definitely limit what else you can put in there with them.
Panfish aren't much better and will get kinda big for your tank. Done perch, and they were the most boring fish
I've kept. An exception would be the little orange-spotted sunfish you can get in N.W. Ohio.
I'd set that up as a river tank - lotsa rocks, gravel and a bunch of current. It's pretty hard to have too much current (my tank has a 350gph main pump, and about another 500 gph in extra pumps). Get a 4' x 4' seine and head to your favorite creek. You should be able to catch darters, dace,
shiners and other goodies. Some of those fish will have colors that are amazing. You'll have a mini-stream ecosystem - Darters, suckers and madtoms on the bottom, shiners, dace and minnows will school around
higher up. All of these fish will feed on frozen bloodworms which makes it fairly easy, better than constantly
getting feeder minnows and such.
Spend some time here -
http://forum.nanfa.org/index.php?sid=5ae7aa7dced0aad3d00b4f5b9b33b774
North American Native Fishes Association. Tons and tons of good info and advice here.
I've had up to 21 species of Ohio fish in my tank at one time, I'd never think of changing it to a tropical tank.
Have fun!!!!