Hope, I'm not too familiar with Cinqular's rate structure, however in my experience most of the North American cell carriers have similar roaming rates for Europe. $1.29 per minute to the U.S. sounds a bit low? You might check the Cingular website, as they should have current roaming rates listed.
Typically the lowest rate is for outgoing "in country" calls, with outgoing calls to North America AND incoming calls at a higher rate. The reason for the higher incoming rate is that calls are routed from the U.S. For example, someone calling you from Ireland will pay long distance to call your U.S. number, and you pay for the call to be routed back from North America.
It's likely that your family plan and other "specials" won't apply, as you're not using the Cinqular network while travelling. Your rates will be determined by the roaming agreement between carriers.
Be sure your Phone has the necessary frequency bands to operate in Europe.
Hope this helps. Good luck!