I'm using a Navteq model that showed up on woot.com a few weeks back. I can't say I'm pleased with it, but the price was right. If nothing else, the receiver on it is really good. I'm able to set it inside the cove that holds the speedometer. It slides around a little, but generally stays there. No suction cup rings, no beanbags.

My other GPS is the one built into my Sprint phone. It is actually one of the best I've used... until it started flaking out. When it remembers it is a phone, it forgets that it is a nav device. So there will be a little popup on the screen saying you've got email, while you blissfully roll right by your exits... Grrrr.

I'm pretty sure my subaru was broken into because of a GPS suction cup ring... so I also strongly suggest you avoid them.