I don't have the original sim, Phonebook card solution didn't work for me and I am not in the US. what do you recommend me to get?

1. Unactivated AT&T sim card from [ame="http://www.amazon.com/Sim-Card-SKU-71234-Unactivated/dp/B001ONWGMC/ref=sr_1_1?ie=UTF8&s=electronics&qid=1281026542&sr =8-1"]Amazon[/ame]?
2. Prepaid 3G AT&T sim card from [ame="http://www.amazon.com/Brand-Card-Cingular-Never-Used/dp/B002G7A8TI/ref=sr_1_2?ie=UTF8&s=electronics&qid=1281026542&sr =8-2"]Amazon[/ame]?
3. something they sell at the store? (my brother lives in the US and can send me something..)

Thanks for any help;
Guy