If AT&T has not scared you off from T-Mobile yet, and its close to scaring me away, then you might want to consider the G2X, the highest of the high-end Android devices on the market. Well, it will soon be on the market. And again, if AT&T hasn't scared you off but you're still on the fence about which Android device you're in the market for, consider this.
The G2X has DIVX capability. That means there's a good chance that if you've got digital movies that you "borrowed", "shared", or converted with your own library, it's DIVX.
Outside of this new revelation, this is, on paper, an excellent Android device worth of any hard-core mobile warrior's arsenal.
More at Android Community.