Blackberry, Treo or Other?

Coincidentally, I'm coming on two years with my current phone at the same time that I'm starting my new job. I'm thinking the timing is perfect to finally dip my toes into the Blackberry waters. I am waiting to hear what the policies, etc. are, but I'm leaning towards the Blackberry World 8800ish. Anyone have that? How about a comparable Treo?