Car Tunes

Happy Monday gadgeteers! ) I need some car stereo advice. I
want to replace the stock head unit in my 2006 Mazda 3 and don’t
know which way to turn. I don’t care about DVD or navigation
features, but the top of my wish list includes iPod integration and
XM radio capability. A USB port (I’ve heard dome HU’s have them
now) would also be cool. I also don’t want to swap out the stock
speakers. Anyone have any advice for me?