Thanks for your patience apple85.
It sounds like this is perhaps an age old question (or debate) on the forum? Unfortunately I do not have much experience with either of these carriers. I currently have phones with Verizon & sprint.
In response to Stinsonddog's Question: I work as a consultant and will be paying the bill personally. However, I am willing to pay the cingular premium if it equates to a higher quality and or more extensive service/coverage. Locally as well as nationally & internationally.
Also, I am currently thinking of signing up with one of the monthly BES providers for full integration. If I understand things correctly I'll have to shell out 2K if I want my own BES. Is this correct? Can someone recommend one over the other for this service? Is there any down side to going with the monthly service?