What do you think of the Mossberg 930 SPX vs the Bennelli M4? I like the fact that the Mossberg is half the cost of the Bennelli.
By "getting comfortable" I mean putting a couple of hundred rounds through it under the supervision of somebody competent, over a period of a couple of days, and becoming confident that you can handle the recoil, that the gun cycles reliably, and that you can hit the target reliably with it.
If you have a wife/girlfriend, before buying you might take a look at getting a 20-gauge, which has much less recoil, unless she's a big girl who can become comfortable with a 12-gauge.
I would also recommend getting a copy of Massad Ayoob's Advanced Combat Shotgun