I think you meant you hate component speakers?
Coaxial speakers are what you've already got.
And yes you absolutely can install a subwoofer. It's one of the easiest things you can do to improve the sound from your car's media player.
Freemind has it right, you need to know your budget before hand so you can make decisions accordingly. The last thing you want to do with car audio is buy one expensive piece and pair it up with el-cheapo hardware.
2011 SES 5spd #006 >> SR #213
What other people think of me is none of my business.