If you're travelling, then you would want to use Cingular service. I had T-Mobile service about two years ago and found that I had little or no coverage when travelling. My travel was up and down the East Coast and out to the midwest. I haven't had that issue since I switched over to Cingular.
I have never bought anything from www.wirelessbuy.com
before. Yet, many of my co-workers have purchased from www.letstalk.com
and they said that they were very pleased with the service and have even referred other co-workers to the site as well who were also very pleased. They have said that they would never go back to the carrier again because they got a better deal via www.letstalk.com
Co-workers who have had the 7105t said that they didn't care for the platform and liked the 7100g better. I have read various complaints of the 7105t on some of the online forums. Yet, Oprah says that's one of the best products of 2005. It does have great screen color and contoured keys.