Griff,
From reading here, and my experience, small ponds in the south tend to overpopulate with large mouth bass (LMB). When this occurs, the LMB won't grow much over about 14-15" and tend to stay skinny, in other words, their weight does not keep up their length. You will have alot of small bass. Assuming you have bluegill (BG) as forage, you will have some very large bluegill as they will get big enough that the 14" LMB cannot predate. You will have some very small BG (1-3") but nearly medium size as the overpopulated LMB will eat those first.
From reading here, it seems that small ponds in the north get overpopulated with BG.
There is a couple of books available from the pondposs.com site, "Perfect Pond-Want One?" and "Basic Pond Management" that would be helpful. My pond is in Mississippi, and I got alot of useful advice from this document before building mine:
http://www.mdwfp.com/media/24904/farmpondmanagebooklet.pdfHope this helps some.
Dan