Travel Technology - Unlocked Treo Devices

I am looking for an unlocked GSM Treo device. I understand that my only option from the Treo store is the 680, which is Palm based. I would rather have a Windows based system. I notice that there are a ton of unlocked GSM 750 devices. What is the story with those devices? I don't want to jeopardize the warranty by buying a unit from a second hand reseller. Thanks in advice for your help.

amazon.com sells them:
http://www.amazon.com/Palm-Treo-Unlocked-Smartphone-Handheld/dp/B000Q6I7EY/ref=pd_bbs_6/102-6258095-5522543?ie=UTF8&s=miscellaneous&qid=1179352602&sr=8-6

Never used them myself, but read about someone else on FT doing something through them:
http://www.mobilebee.com/Palm-Treo-750v-Specs.html

Yeah I have a cousin who has used Mobile Bee in the past and recommends them. I think that I don't want to spend that much, I'm going to order the 680 unlocked. Thanks.

If you want a Windows-based smartphone, and want to use T-Mobile service, you should take a look at the Dash. Mine is now running WM6. Has WiFi as well as EDGE.