Which is better?(sites included)?

I have been also looking for phones too from T-mobile...

I would get the first one the Samgsung Gravity White with Aqua. Its free if you already have your 2-year extension. It also has a qwerty board when you slide it which is nice too. The camera is pretty decent a 1.3 camera.

I don't really know but it is your choice. I would still choose the Gravity out of the other two ones you picked.

Or you could think about getting the T-mobile Blackberry Curve also has qwerty board too.