As far as the cost is concerned and being fair, I'm not qualified to answer that. Its very region dependent and operator experience dependent. Hopefully someone from your region chimes in here.
FWIW, and since you are still deciding to built a pond or not, realize now that to build and maintain a pond, of any size, it takes time, work, and expense. EVERY year. Not do differnet from having a really nice lawn.
For me like a lot of others on here, I love this hobby so much it consumes me. When people ask me how much I've spent, I tell them I would have spent 4 times the amount.
As far as a .064 acre pond holding fish, absolutely possible.
