Thank you all very much for the information. This is exactly the responses I was looking for by people who know what they're talking about. I think you finally straightened me out on the differences between BIS and BES. I know BES is out for me so BIS is my only option so I'm leaning towards this and staying away from Palm or Windows OS based units. From what I've been reading the BB os seems to be more stable. As long as I can sync my contacts, calendar, task list, etc via the USB cable I should be ok. I can live with my email being delivered on a slight delay.
Now I'm debating whether to go 8830 or stick with my original plan which was the 8703e.