My wife still has an unlocked Treo 600 that she uses on T-Mobile, but it's developed a buzzing sound during calls. She'd like a 650 and I've read on here that one can unlock a Cingular 650 by flashing the rom a few times.

So, I have two questions:

1. Other than the cosmetics of one phone saying "Cingular" is there any reason to buy an unlocked/unbranded phone over the branded Cingular phone?

2. Where can I find the best deal on a new (w/o service) Cingular or unlocked 650?