I've got the kenwood/gamin unit. I really like it. Its nice that you don't need the VSS wire. It uses the gps to track speed. The bluetooth add on just came out about 2 weeks ago. AND it's $199. That's way too much for the little bit I use of bluetooth. The ipod control is $50.
As for the smash and grab, my windows are tinted so that you can hardly see it (still legal though).
I know this post is for the Avic Z-1. I have the Avic N-1, which doesn't have TV tuner or 30 gb hdd, but everything else. In all honesty, I love the thing, but there are limitations. Such as: most recently I had to send it back to the Pioneer factory after 2 years, because the screen has a shelf-life of 1500 hours or so. Keep in mind that this is another $200 fee. Not to mention the labor for installing it because it's tricky to get the stealth GPS hidden where it gets good reception. True, it costs a lot. Mine was like $3,000 with 2 12's, 1000 watt amp, rear camera and hidden DVD flip swtich and labor. But, it's also so sweet. I would also recommend getting a remote control because you don't want to be pushing all those buttons up front when you're making love with the seats down.