All the phones you mentioned are good phones. However, I would lean towards either Blackberry or iPhone. This is due to Windows Mobile that is used in Blackjack can be a bit clunky and slow.
The decision point here is the keyboard. If you don't do lots of typing (answering e-mails or texting) and can live with on-screen keyboard, get the iPhone. It's great as a music player (it's an iPod with phone functionality) and have tons of great applications.
If you are heavy on typing, it would be Blackberry with the real keyboard (e.g. Blackberry Bold). I could be wrong but the way I look at it: play is iPhone and work is Blackberry. Again, this is my personal opinion.
You should try both in store and see which one you prefer in term of size and usability. I have attached clip from youtube on Blackberry Bold vs iPhone. Hope this helps you in decision making.
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