I'm with Backwoodsboy on this one. First of all, have you done a true price comparison? A local store had both the regular 870 and the tactical version on sale. The tactical version was about $400 more. I did the math and realized I could customize the basic version with the same gear (i.e. the Magpul MOE) for about $100 less. Besides, firearms are a fascination to me, so learning the basic assembly, function, and gunsmithing needed to make those changes would be well worth the time.
As it is now, this is YOUR tactical model...not some factory standard. When a friend asks "whoa, where did you get that!?" You can say, "I modified it myself."