Replying to Choosing Subs - 1998 Chevy Tahoe

I am looking into getting some subs for my Tahoe. I know nothing about the business of car audio. I'm not looking for super duper car shaking woofers. just something that has some nice solid kick to it. Something that sounds super clear, but adds another element to my tunes.

I'm not looking to update my radio (header?) or any stock speakers, just something to throw in the trunk for some extra bump.

Looking to spend as little money ass possible (less than $500)