You should get a decent trade in value if you follow the link above. If you are trading up from the 500 go to the 800. From the people that own both that posted here, it is an improvement over the 600. By the way the 800 is a sealed design, all the other Axiom subs are ported fyi.
PS: Call axiom and ask if you can order the 800 from the factory outlet along with the tradein. You might be able to shave a little extra off the cost.
I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.