+++1 on the "one that fits" advice. I was lucky enough to get that advice when I was shopping shotguns and it saved me from making a big mistake!
You've noticed how much support there is for the 870? I got a chance to shoot it side by side with a Winchester and a Mossberg. Just didn't like the feel of the Mossberg (and one broke!) 870 felt ok, as did the Win, but when it came to shooting I hit over 80% of my shots with the Win right off the bat- but missed about 80% with the 870! Also, I kept having the spent cases hang around in the chamber of the 870 and would have to turn the gun over and shake them out- the guy running the booth said he couldn't see what I was doing wrong and had never seen that before- and I've never had that problem before or since with any pump.
Anyway, I bought the Win and am very happy, but the lesson I learned is that it really doesn't matter how good (or how popular) a particular gun is, the best one is the one that fits and works for you.