I wanna get a HD radio but I dont want to buy a whole new deck. So what are my options? Do they make a universal unit that will work with any aftermarket HU? I have a Alpine CDA-9813 it does have the Ai-Net input on it but Im not too sure if Alpines HD tuner will work with my HU. Any info on that? I just want something thta will work with my stereo. I dont really care if its one of the dash mount or window mount ones,I just want a HD radio. If the Alpine HD tuner will work with my HU then I would prefer that. Any brands,links?