The 870 is the most widely used shotgun platform for a reason. It works. There are probably a million of them strapped in cop cars across the US.
It's either an 870 or a Mossberg 590. The better gun is the one you are more familiar with. I was just curious because if it was an unusual variant that had your eye, you could probably find it on gunbroker.com for whatever the true predominant going rate is. Less than retail. Then you'd have to pay your local shop for the transfer, of course. But you could get the one you want, rather than whatever you can find in your area. Just a thought. I've had good luck with gunbroker. (Maybe you have too.)
Speaking of your area, marinized would be a nice touch.