My '05 hatchback came with the AM/FM/ radio only as I used to use XM satellite radio.When they merged with Sirrius prices doubled. Bye-bye XM. I do have a 4G smartphone with unlimited data, so I listen to internet radio and apps. (Pandora, iHeart, ESPN...) Got the mechless receiver as I have all my CD's converted to MP3. I now have a fantastic sounding audio system that links to my smartphone wirelessly. The sub is under the driver's seat but could be placed behind the back seat. This powered sub is a bit pricey but mades a world of difference in sound quality! Still using the stock speakers. Cell phone quality is outstanding through the stereo.
* Sound Ordnance B-8PT Single 8" Amplified Flatsub - Ordered from Crutchfield
* JVC KD-X50BT Digital Media Receiver - ABC Warehouse on sale w/free installation