I would go with the Supernova in case you want to change stocks. You may prefer a pistol grip stock for turkey hunting. It is more comfortable to use when you are sitting.
I would also go with camo. You will probably regret it later if you don't. It looks cooler and will also help you out when turkey hunting.
If you haven't decided, for an all-around shotgun I think a 26" barrel would be preferable. A 24" would be easier to maneuver in the woods, and I like at least 28" barrel for duck hunting and trap shooting. I say split the difference.
To me, the Nova is a very limited purpose gun with the fixed stock and lack of accessories. The Supernova is a bit more versatile.
Good luck!