Looking to switch carriers and have decided on a Blackberry Curve, but cannot decide between Verizon and Cingular. I only need a few minutes (400 - 500) and at least 500 sms messages per month. I get a 15% discount on Verizon through work and an 8% discount on Cingular, which will make the monthly cost similar.

Any pros/cons to choose one over the other?