Looking to upgrade the sound system in Stringray 230 SX

[heyitischris]

Hi,
Can someone give me some recommendations for good audio upgrades for the Stingray 230 SX?

Right now, I am considering the following:
-replacing the 4 cabin speakers
-adding subwoofers (need recommendations on the best setup, e.g. box vs open air)
-adding extra battery
-2 amps
-possibly changing out the kenwood cd player because it doesn't have iPod hookup


If you guys have any recommendations from previous installs I would love to see some photos.

Thanks for any help!