this is what i would recommend for you.
http://www.mdshooters.com/vbclassified.php?do=ad&id=8926
this is a good deal, and the seller is a good guy.
Whichever you choose, think about putting a nice tactical light on it. In a home defense situation in the middle of the night (or anywhere for that matter), you don't want to shoot what you can't see. A strobe light is great, too, because you would disorient the bad guy while being able to see perfectly clearly.
All good advice...but these two are:
Best advice here so far.