I think 'tactical' is relative. For me, tactical (in a pistol) is:
- Full size for maximum comfort (I have long hands, so a thick grip gives me better control)
- Full size for increased mass = recoil absorbtion
- Full size for maximum ammo capacity (as stated, my Girsan has 18rd mags. But I know a place that was running a package deal for 10x 30rd mags. I call it "The Last Stand Bundle"

)
Now for home defense I think it's a different story. To me the tactical weapon choice would be a Remington 870 TAC-14 short-barrel shotgun.

Point and click......or rather "Click, click, BOOM!"
Although it does lack ammo capacity, I think the sheer intimidation factor of the sound of it being racked would be enough to make most would-be home invaders seriously reconsider their poor life choices.
That shotgun is not available for home defense in my country. Handguns can't be legally used either. Unless you have time to :
* go to your safe, open it, retrieve the handgun
* go to the other safe for ammo, open it, retrieve the ammo
* load the handgun
* make sure whoever is trying very loudly (how would you have time to do all this otherwise?) to get in your home is armed
before shooting.
I agree with full size etc. But I said tacticool and not tactical. Wich means rails, threaded barrel and optic ready. x)
I'm also finding myself salivating in front of the FK Brno.
For home defense, a full size pump action shotgun is still legal under a few principles and mainly using rubber ammo to prove your did not intend to kill.
And I agree about the sound being intimidating.