Cheapest way to use Sprint TP2 w/ MR in Italy?

[yazyazoo]

My wife and I just booked a trip to Italy. We both have Sprint phones that have World Capability. I have the TP2 with MightyRom and she has a Blackberry Tour.

I was wondering what would be the cheapest option for using our phones out there to keep in touch in case we get lost. Would using the Sprint International Plan the easiest? I read that it may be best to just buy a prepaid SIM card in Italy when we land. I want to be able to text and maybe call back to the US to tell our parents we landed safely.

Will the MightyRom still work with the Sprint International Plan? Will the MightyRom work with any SIM card or do I need to do anything else to the phone before I leave?

Thanks for and advice!