The V557 is nice, its free after rebate, but you said you like an external color screen. In that case I would recommend a Motorola V3. It is available from Cingular in silver, black, or pink. It was on sale a few weeks ago for $49.99, but now its $99.99. They'll probably put it on sale again in a few weeks. -Jay
If you don't mind shopping online, I just started a new line with Cingular through Amazon - got a black RAZR for $99.99 but with a $200 rebate, so I make $100 on the deal. Pretty good if you ask me; I have bought 5 phones now through Amazon and have had excellent customer service with them - YMMV.
The Nokia 6102i is around the bend, it will be at a good price point, have BT, and wont have Motorola's UI which I think is terrible. The Sony Z520a is a good buy as well IMO.