Connect iPod, USB and SD cards to car radio

Hi guys. I'm looking for an adapter to connect my iPod and iPad mini to the car radio. Would be perfect if it also supports USB, SD cards and devices with AUX connector. To have it all in one kit...Do you have any recommendations? So far I've found only one car kit AUX Link that has all these features. Does anyone have it to share your opinion? Can you suggest other brands? Thanks a lot!