Tim's suggestion is a good one.
I've noticed no streaming differences between my iPad 1, iPad 2 or iPhone 4, or my husband's iPad 1. Most of our streaming is done on the iPads, though. We stream Netflix, Pandora, domestic and foreign radio via the TuneIn app, and U.S. podcasts. And we regularly do that on both coasts of the U.S. on wi-fi at our homes and the homes of family members.