Let the hive mind of Engadget get that for you.
"I just switched to Sprint from Verizon about three months ago for the Pre. Then I went for the Hero about a week ago. Now, I miss my hardware keyboard and am thinking about switching to the Moment. I am still able to switch back to Verizon if I want and get the Droid when it arrives. Should I just trade up to the Moment when it comes out, see if I like it, and if not switch to the Droid? Or something else entirely? Help!"
There is no requirement in CA, "requiring the use a headset of some sort". The requirement is to use a hands free device which includes more than headsets. I use the Blueant Supertooth 3, I refuse to walk around with an illuminated dildo sticking in my ear.