Yet another stocking suggestion from me: stertlet sturgeon!!! i've always wanted to keep one of these. They're friendly, peaceful, and would impress any of your friends because they look like a shark and are rarely seen in home ponds, especially with water as clear as yours. You can get a juvi on aquabid for pretty cheap and he'd grow pretty fast in such a large pond. And for schooling fish, my vote goes to either jumbo zebra danios or rosy reds with a large piece of driftwood to shelter them so they can have a place to feel safe to breed.