I have to comment a bit on the 7100's keyboard.
Go into any store you can find that has a demo 7100 and spend about 15 minutes playing with suretype. By this, I mean try to compose an e-mail that you would in day-to-day use.
If after that time, you feel it to be natural, the 7100 is for you. If you still find it annoying go for a full qwerty keyboard model.
I love suretype on my 7100 and am very fast at it, but others can't get the hang of it