Sub 500 I would look at the kahr. My only experience was rent and shoot at the range.
If you looking for super light, reliable and cheap, I carry a Taurus 380 TCP. It's tiny and light, been flawless, lifetime warranty if ever need it.
I also have a Taurus 9mm PT111 (wife's) and a Taurus Ultra lite 38. All have been totally reliable.
Museum pieces they are not, if your looking for quality of workmanship, fit and finish, they are not. But they will best/anything within $100 of their price range and they will shoot accurately and go bang should you ever need it.
Of course for people into guns the TCP may not make you happy, more so if your willing to spend 2 pr 3 times the price to admire something, if that's your thing, which I understand completely the TCP isn't for you.
If like me, you just want a simple inexpensive accurate little gun that you can literally put in your pocket you may want to check it out.
Let me take a step back on the Kahr, if I remember correctly it was easy to limp wrist. I have no been getting the itch lately to get something new, doubt I will but find the Diamondback DB9 interesting for a super compact 9. No slide lock but whatever.