I was facing the same decision and, last night, I got my first Blackberry - an 8130. So far, I like it. The only thing about suretype that I find anoying is when you want to type non-standard words. I was referring to Sen. Obama in an e-mail, and it took me about 5 minutes to type O-B-A-M-A! It always wanted to guess at some other word. I'm sure there's a way around this behaviour. I just haven't figured it out yet.
Overall, I am very happy with my decision. Good luck with yours.