Chuck,
Check out the PML pans, the correct capacity to get you the extra cooling but not so much capacity as to waste fluid, especially synthetic if you go that way as it's pretty expensive. They are cast aluminum and are NOT powder coated, powder coating is one of the best insulators out there, why would you insulate a pan if reducing heat is what you want by buying a pan in the first place. Magentic drian plugs, cast in bosses for temp senders if you need it, socket head hardware and a very sharp price too.
Mark @ DPPI