Does anyone have any recommendations for a 4 port (or whatever, at least 2) USB charger? I have 2 iPhones (one main, Sprint, and an AT&T GoPhone for backup use) and would like to charge them both at the same time. The AT&T one doesn't have a charger. I figure since I have to buy a charger might as well get an all in one. Monoprice has a 4 port one that's pretty inexpensive but in reading the reviews, they're saying if you charge an iPad the rest of your devices get crap. I don't have an iPad but MIGHT be planning on getting one in the future.