Pda phone review

I am looking into getting a PDA/Smartphone. I have looks up the reviews for both the BlackBerry Curve and the Blackjack II and both have favorable reviews. I would be using the phones mostly for calls/texting/internet/and things such as ringtones, games, etc. I would not be using it for email.

Which phone should I purchase?

I am switching from a blackberry curve with a data plan but I want to switch to a HTC pda phone. If I switch do I have to change my data plan, if so please tell me how and is it going to cost me more money.

If you own a blackberry curve 8330: Do you like your purchase? Are you satisfied with this phone/pda? What is your opinion of the phone?