I would get the 8 shot gun. The extra 1.5" of length is negligible as is the extra weight of the empty gun. When you load 2 more shells in the 8 shot gun, you will notice some additional weight, but this might not be all bad. The extra weight will help reduce recoil as well as help hold the muzzle down when you fire the gun. Besides, if you decide later that you don't like the extra weight of the fully loaded magazine, just put 6 rounds in the magazine.
I really like how my 18" barrel with the 2 shot extension feels. IMHO I think the extra length makes a big difference when manuevering within a home. Besides, its pretty darn unlikely that you will ever have to fire more than 1 or 2 shots in a defensive situation. Add a side saddle, and shell holder on your buttstock and you'll have plenty of ammo.
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