It depends on what you are looking for and what kind of cash you have to spend. You can get just the speaker, or a 2 way, or a 3 way. There are a lot of combo's out there but you need to look around at all the 6.5" speakers and make your choice. If you are goign to run an amp, you need to match the ohms of the amp to the speaker for max performance. The sterio (HU) will need to be done much the same way as well.

 

If I remember right, the stock speakers are 8ohm and that would be what you need to go back with for better sound. I'm partial to Pioneer but any company will be better than what you have in there stock. I don't care if it does say "Bose" everywhere.