I have a Sony XAV-AX1000 (similar to the XAV-AX100) in my '99 LX, and it looks like Best Buy has it in stock. I really like having the physical button, and so far I've had no major issues using it. Primary use has been Apple CarPlay for music (Spotify), phone calls, nav (apple and Google maps), etc. Biggest complaint is the resistive touch screen, which tends to wash out in direct sunlight and doesn't handle glare well. Its not a deal breaker, but if I were to do it again I'd look for a capacitive screen (more expensive but less prone to glare).
If you have the Nakamichi unit in your LX its a bit of a pain to install a new head unit since there aren't pre-made wire harnesses out there, but there's some great threads on here that walk you through it.