My favorite home defense shotgun is an AR-15. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />
If you could find it...an 870 Wingmaster in 28 gauge would suit you well. Cut the barrel to 18.5 (or find one)....or better yet, 12" and register it SBS.
I like the looks of a SBS with wood stock. Not quite tacticool, but reminds me of the old school gangsters.