CAW - we actually stock quite a few ponds with adult or subadult LMB up here. The reason is that fingerling-stocked BLG usually spawn at age 1, but the LMB not until age 2. Stocking the adults puts the package together sooner.
We usually stock at 40/acre, and we like those 8-12 inch sizes that CJBS mentioned. That would mean about 50 or so for your pond? That's a bit higher than CJ suggested, but I'm pretty conservative about having enough LMB to control the panfish. I'm also with CJ on the bluegill idea -- they do provide far more prey.
Good luck! Good fun.