(I also wouldn't put my life behind a Kel-Tec if I could avoid it, which is a better argument against the 2000. That's the firearm equivalent of running your website on a secondhand overclocked pentium 4 box. I own some of them and am fine with them on the range but can afford better and do.)
The only exception is perhaps at ranges of < 1m where you're grappling with an assailant, in which case a snub-nosed revolver is probably the ideal choice. But that's not really a typical scenario, and I'd wager sight lines in your home are generally > 1m.
Consider that soldiers use carbines, or occasionally shotguns, when clearing rooms, not handguns.
In which case you should strongly consider transitioning to using it as a club, which has been a point in at least one (Clint Eastwood) movie. Especially since your retaining the weapon is much harder than if it was a handgun (see my comment elsewhere about my demonstrating this to a nephew).
I'll take "What is a carbine chambered in a pistol round for $200, Alex."
The SUB-2000 uses the 9x19 round, so it's basically a pistol with better ergonomics.
Defending a home with a full rifle round in close quarters, say a .30-06 or 8mm Mauser, would be kinda silly--but that carbine is fine.
Me, 1911 for retention, and maybe a long gun if I'm bunkering waiting for the police to arrive (slow to access in the main gun safe).
Under stress, people are much more accurate with long guns.
On the other hand, they have terrible weapons retention properties, as I've e.g. demonstrated to my taller and fitter nephew about the time he graduated from high school, quickly ripping my shotgun out of his grasp by gaining a longer lever arm by grasping it outside his grasp. And without injuring him, but an adversary wouldn't be as gentle, especially after gaining the weapon.
This is what the all too common recommendation of a shotgun for home defense hinges on. And in more than a few states that highly restrict handgun ownership, a shotgun is much more practical, which is what I did when I lived in Massachusetts, the first gun I ever purchased.