to me bluetooth is over rated. It is nice for a wireless connection and transferring small amounts of data. But most units use cheap microphones for the in car hands free so the caller on the other in hears crap. My theory is crap in crap out. The DEH-7000BT is a good head unit with the built in bluetooth. However if you get the DEH-P6000UB it has a better display and the usb built in so can charge your mogul and control the music you have on the storage card when hooked up in USB mode. Its also a little cheaper then the DEH-7000BT.
Or you can go the route that I did with my mogul and use the built in aux in on most pioneer radio's with the cd changer port.
You can buy the cable or make your own for cheap. I hacked up the stock headphones that came with the phone and 2.5mm headset splitter to be able to use the mic from the headset for handsfree with stereo audio output. The splitter also allows me to charge the mogul @ the same time. I extended the cables to the mic and wired to the splitter. I mounted the mic at the top of my a pillar on the drivers side and ran the cables down behind that into the dash (wires hidden) back to my cradle. The power comes from the inverter that i have that has usb charging that gets routed into the splitter. I only have one connection that i need to make to my phone when i get in the car the splitter. I get audio out into the pioneer deck the mogul charges and i can accept calls and the music pauses and resumes when call is over.
I have been working 12hr days for the past 6 days and have not had time to post pictures of my install yet. Once I get time off. 24th of Dec. I will take and post pictures of how nice it works maybe even a youtube video if i have time.
http://forum.ppcgeeks.com/showthread.php?p=580026 thats the thread that I will update soon.
To me this is your best route as I don't have to worry about having the phone pair with the head unit or battery draining with bluetooth on while not paired to the head unit. There are some expensive dash mounts out for the mogul that have audio and mic features built in with charging support so all you would have to do is get in car and dock the radio if you wanted a simple solution.