most people around here use Pioneer HU's. They offer an adapter ($25-30 or you can make one urself) which allows Aux. Input. I have a Pioneer Premier w/ Aux Input and it sounds great. I would also consider getting a Kenwood HU, some of those have Aux. Input. There are a bunch of HU's that have Aux. Input (www.crutchfield.com...look on there), you just have to look. how much are you willing to spend on the HU?