My Hunting guide (for upland birds anyway), and his colleagues all swear by the browning BPS pump shotgun. They say it is probably the best pump on the market. Not cheap though.
I have always liked the Ithica model 37. You can still find new ones even though they went out of bis. Also not cheap.
The remington 870 wingmaster is a great gun and nicely appointed but also not cheap.
The remington 870 express is an awful lot of shotgun for the money. You
can get the 2 3/4 inch model for around 200 bucks and I think the 3 inch model is abdout 50 bucks more.
And lastly this might be the time to buy a Winchester 1300 pump while you can stll get them made in the USA
okcmco