Some of the new express models have full lengthy mag tubes so you don't need a extension tube.
Not sure if I like or don't like that.

I'm thinking Nordic components mag tube if I get a gun that needs one.
Mesa tactical side saddle.
New follower
Over size safety
And I want the gun to come with ghost rings because that a expensive up grade to do later.

The only remington 870P I like avalible from the factory is the 24591 model but I'm not sure if u can find one or how much it would run.

Also I'm not sure how the Remington finishes will hold up.
I have never heard of somebody having to refinish a nova.
But my remington is almost brand new and it lightly misted when I was deer hunting this fall and with in the hour I had surface rust on a oiled gun.
My sisters remington also suffers from a weak finish.
But my dads old 80's model 870s finish is tough I've seen it hit concrete and not a scratch.