Blackberry devices are over-rated and the "hip" thing for kids. If you need enterprise email, BB is the best current choice, followed closely by Android, but for the average consumer, they are a poor choice. The selection of apps and games is limited, over-priced, an sluggish. The BB browser is terrible compared to any other smart-phone platform such as Android, Palm Pre/Pixi, and even the iphone.
If you are going to get something that requires an unlimited data plan for $30 a month, the only 2 phones Verizon currently has that you should even consider are the Motorola Droid, or the Droid Eris.
20,000+ apps, 3000 new ones a month hitting the Market, 2/3 of them are free, great web browser, and Verizon does not disable the GPS units like they do on their blackberry units, just to name a few advantages.