unfortunatly my car doesn't have the bose sound in it. The car sounds pretty good but I need a little more. I was thinking of going with subs but i am not going to go out and spend a crapload of $$ on a system. I want to keep the stock head unit. I just need better than what I have.

What are some decently priced subs that sound good. I really don't want to dynomat the trunk.

Or should I just upgrade my speakers?