When i first got my 180, i had M60ti's V1.0 if you will... The drivers are pretty much all the same. The v3 has a different crossover, but the drivers are still the same. So, with that being said, the 160/180 will go with all Axiom products.
Some argue that the 160 is "better" than the 180... i don't have an opinion on that... I would say it would only be worth upgrading if your only going to be out a couple hundred bucks... Do you plan on selling your 160 on the auction site to off set the cost of the 180?
I would say if your paying full price for a 180 it would not be worth going from the 160 due to the marginal difference in performance between the two speakers.
