Have you looked into Polaris? I'm pretty happy with my 15.5ft aluminum "Spirit" with an interior built to my specifications for diving. Bench seat with dry storage, a tiny console to not take up excess space, nice big anchor locker, and a 8 tank rack I designed. Load carrying capacity with a 60hp has been tremendous.
I don't have any firsthand knowledge of their larger models, but if they are anything like the one I have you should check them out.
http://www.polarisboats.com/