I would have to say that you are covered in the defensive handgun category already. With 2 walthers in the house you should be ready for anything. As far as home defense guns go I like shotguns. You can get a Maverick shotgun for less than $200 and take it to a gunsmith and have the barrel chopped and "jug choked" for just a few dollars more. Load it with #8 shot and there you have it, quite possibly the most formidible home defense weapon available. Not trying to sway you from the SP101 but a shotgun is better for home defense and a lot easier to handle and hit what you are aiming at. If you get the sp, get a set of lasergrips, they are a great product. S&W offers their smaller revolvers with lasergrips in a package deal that would go for about $500 or so. The sp101 is fun to shoot and if that is what you want to do go for it.