I recommend you look at the H&R Pardner Pump brand as well.* I recently purchased a Pardner Protector for HD ($200) and couldn't be happier. It's an 18.5" barrel, fixed I/C choke. I can't answer your skeet/trap question, and I actually wouldn't mind knowing myself, but for my situation (dedicated HD gun), the Protector was the perfect answer for me. For the price, you can actually get the Pardner HD gun AND a Pardner field gun for the same price as a Rem 870 with an extra barrel.
Mossberg has a pretty good combo set with a short HD barrel and longer field barrel. And you can always get a Remington 870 and purchase a second barrel so it can do double duty as well. Just depends on how much you want to spend. I believe the Mossberg combo is considerably cheaper than the Rem 870 option, but I could be wrong on that.
Try all the brands you're considering if at all possible. See what works best for you. Good luck and have fun.
*If your a "Buy Amerkin'!" type, don't bother even looking into this option. Some of the parts are machined in China and then shipped back here and assembled in the US and sold from a well-known American gun manufacturer. This upsets some, to the point of calling it junk. Despite the 1,000's of positive hands-on performance reviews and the lack of any notable performance negatives (no matter how hard I try to find them).