it depends from where you are calling from?I mean from which city? If you are callling from dallas, dallas Q is the good one..else you can try himtel....the connections are good though it is little expensive, but i believe it gives 35 minutes for $5...and 23-25 mins for $2 but u have to buy at least 2 card if u buy  2 dollar card...Let me know from where you are from and may be I can help you find the good card for you.