$100 at Kragen in So Cal. I'm not sure if it does data logging.

 

if you just want to read/clear codes, you can get a standalone OBD scanner for about 130 bucks.

 

I got a response today. He didn't say much about the GPS capabilities. Just mentioned that he didn't know about Earthmate compatibility.

I too would love PDA capability. I have a Palm Pilot and several of the systems support it.