My most recent 870 I got about a week ago. Mossy Oak camo supermag $279.00 at Wal-mart. Even had sling studs. I found one that has a very smooth action with a good trigger. I shot 4-boxes of shells today and it functioned great. I will throw a 1000 through it this summer to break it in good. The camo finish is very good quality and should prevent the rust problems the express can have. Under $300.00 for a camo dipped 3 1/2" Remington is hard to pass up if you can find one with a reasonably smooth action.
Gun fit is the most important. Go to the gun stores often over many trips and handle all the guns in your price range and maybe a few just above. After many different days of handling them all you should find one that stands out and after a while it is the only one that consistently feels the best. Buy that one. All the reasonable priced pumps from Win., Mos, Rem, and Benelli are good guns for what you pay. If you find that one of the guns that's a couple hundred more is your dream gun then save a little more and get that one, or find one like it used.
More ammo! I need to shoot something!