I have a Blackberry Pearl, and it's nice but be forewarned that Blackberry and Mac (at least w/ Tiger) aren't too compatible.
You need to either use the pocketsync software that blackberry makes available free for mac users, which is a pretty basic program, or pay around $40 for a higher end program. The pocketsync is basic, and kind of spotty. Verizon also doesn't really do support beyond reading off RIM's website if you call in for troubleshooting. You can still sync addresses/numbers etc, but I've just been disappointed with it.