Update: My Becker Monza experience

All of the Becker head units are expensive. The Monza line goes for around $580.00 - $600.00 USD (depending on currency conversion), so you could buy almost three of the Sony CDX-F7700's!

Well I can tell you from my experience it is worth every penny. It is by far the best head unit I have ever had and used(1). It is very easy to adjust and use, the Aux-in works great with my iPod and would work fine with any external source. You could add a CD changer (not what I'd do, but you could). Audio CD's sound great, obviously; the MP3 function is very easy to use and control, one slight irritation is that you can display MP3 artist / song info on the screen but that's all so I guess from one respect that's kind of cool but I like see the other information too. It is nice to push the button, see the MP3 info and then push the button to display the usual info.

The FM (RDS stuff) works very cool even here in the US, several stations display artist and song info. It has manual programming or the auto search format that goes by the strength of the stations, the name or type. I first thought was clunkly but after I RTFM it is very cool. I know, newer head units like the Sony have a feature that will "load" strong stations into the presets but the Becker does this on the fly.

Sound quality exceeds the stock head unit and as I mentioned it is better than the Sony I had for a few weeks. The Sony was actually louder but it was not as clean. The Becker is loud enough to hurt my ears but it still sounds really clear, crisp and sharp. This is with stock amp and speakers.

(1) Head units I've used and owned:
Sony
Blaupunkt
JVC
Jensen (don't laugh, it worked very well)
Alpine
Panasonic