If so, which one(s) do you have?
Personally, I own a Glock 23, although I don't actually have it at home with me because I'm a college renter and my landlord doesn't allow weapons on the property. It's a reliable home defense pistol that you can easily carry concealed (although I never have) and it's a good value price-wise.
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Nope. I don't have a good way to keep it safe, I don't have time to practice at a local range, and since I live downtown, I can't be sure what's behind an intruder in my apartment. I do have NRA stickers on every window, though. ;-)