God. I don't know why you wouldn't get the 20 data plan. At first I was like man I don't need that/can't afford it. Once you get your first bill and see how much it is going to be you will be like damn this isn't as bad as I thought it was going to be.
T-MO is way cheaper then everyone else I still think!
P.S. I just switched from the 8100 and I'm happy with my purchase!
Blackberry: 8700g, 8700c, 8100, 8300, 8820.
Now with the new and improved 8530.