I use an Invisio G5, it's comfortable enough to wear all day and loud enough that I have to turn the phone down. The case is also a charger with a battery to recharge the earpiece as needed. About 4-5 hours talk time on the earpiece with another 20 or so hours from the case battery. The case charges off a mini USB, just like the TP2 will. Their customer service is also great.
http://www.nextlink.to/content/us/in...specifications
Only issue is that they are getting rare and hard to find.