Does anyone have any using any of the various aftermarket navigation units?

I have a 2003 Accord and I am frustrated at not having mine work properly. My navigation is crazy expensive to repair ($800-$1200 for replacement). I'd by happy to spend $400 for an aftermarket unit that works properly.

I HATE how ugly the Metra dash kit is, and I love having my glovebox. My biggest gripe with the navigation not working is that I can not control my air, set my radio stations, set my clock, etc.

Has anyone had any experience using the beautiful aftermarket units on ebay or amazone, etc?