The company I work for has offered me my very own Crackberry - one of these

Should I take it? I can think of several pros and several cons
Pro:
- It's free with unlimited data and unlimited local and long distance.
- It synchs to my e-mail.
- It does mobile IM.
Con:
- I've got a cellphone I really like (although it IS dying) and I don't think I can keep my number.
- I can't cancel my old cell plan without a $200ish charge until November.
- The Crackberry connects to my WORK e-mail.
Decisions, decisions.
I don't want to carry both b/c the entire reason I have the phone I have is to take advantage of device convergance (mine does some PDA stuff). Also, I've been eyeing a new phone for myself which will fold in two more devices:
I like the idea of the walkman phone b/c it has a 2 megapixel camera (that means decent snapshots), 20 Mb memory onboard and a MemoryStick slot for MP3s, MP3 player with stereo headphones (I can even plug in my own earbuds), decent calendar, and robust contacts. It's also way less expensive than most of the Windows Mobile 5 phones that are full of functionality I'll probably never use.
What should I do!?!
-- Matt Ranlett