I bought this for a buddy of mine. It has everything you're looking for. An aux, usb on the front, ipod direct connect, hd radio built in. And you can change the colors on it to match your interior lighting.
JVC KD-HDR70 (KDHDR70) In-dash CD/MP3/WMA Car Stereo w/ HD Radio
And yes, polk are good speakers. If they fit your budget and you like them....do it to it.