I'm looking to buy subwoofers but i'm unsure on quality and things like that on what to look on/into for a subwoofer. I know watts but what else makes a subwoofer good besides size?

design/materials/build quality like pretty much everything else.

how much money you looking to spend?

you'll have to buy subs/box/amplifier/amplifier wiring kit to get them going.

Got a tundra amplifier already along with all the wiring. Just need a decent subwoofer

need to know the amp model so i can look up its specs.