Browning BPS Hunter model....is my go to gun choice for a pump gun / I've had this model in 12ga and a 20ga since the 1980's ....and they've been thru a couple of boys and now some of the grandkids ...and still going strong ( maybe 50,000 shells thru the 12ga alone...).../ both with 28" barrels.
http://thefiringline.com/forums/attachment.php?attachmentid=43354&d=1236031619
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Specs on the new BPS Hunter model with a 28" barrel is a good choice for an all around shotgun...
http://www.browning.com/products/catalog/firearms/detail.asp?fid=011B&cid=012&tid=211
list is $ 700 ....but they're selling new in most areas for between $ 575 and
$ 600...especially this time of year with a lot of sales going on.
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The BPS has changeable screw in chokes, solid actions ....they eject out of the bottom so hulls end up at your feet - easy to clean up in the field / the safety is on top of the Tang...so its much easier to reach and operate even with gloves on in the field...they're "cast neutral" so a leftie or a right handed shooter will find they "fit" them pretty well.
Not a high end gun ....just a good basic pump gun.
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I'm not a big fan of the Remington 870 pump guns - especially the low end models like the Express...or the Mossberg options / they've both cheaper than the Browning BPS --- but in shotguns, and most guns, you really get what you pay for in my view. Eventually both of my BPS pump guns --- will go to one of the adult boys / and on to the grandkids...and maybe even another generation or two down the road.../ and while the old Rem 870 Wingmaster models were fine solid guns ...the cheaper 870's today, will probably not stand up to that kind of generational usage...( in my opinion ).
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If you want to look at a serviceable semi-auto ....look at the Browning Silver line of guns....
They have a Silver Hunter model as well... / that sell new for around $1,000 in a 3" chamber...
http://www.browning.com/products/catalog/firearms/detail.asp?fid=020B&cid=011&tid=350
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Pistol grip shotguns...have a number of disadvantages to "wing shooting"...in my view...where "follow thru" are critical skills...the separation of your hands on a pistol grip seem to change the swing dynamics of the shotgun / and make it easier to drop the elbow on your trigger hand side ...where you're not using good gun mount fundamentals...( both bad things when you're shooting flying targets....).../ if they worked - you'd see more of them in the field, but they don't ....