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Both my 12G are just defense guns...the Mossberg has a Bushnell t-dot on it right now (aka. "Fakecog")...I'm pretty happy with it. With the ATI 6 position stock, lines up nicely. It is big though.
I'm running a Burris Fastfire II in a Picatinny protector mount on my 590A1 and an Aimpoint Micro H1 on my 930. Both good, but in some ways I actually prefer the FF since it 'disappears' a bit better from my field of view. Trijicon RMR would be good too.