I know in recent blind AB tests the 350v3 did better overall than I believe one of HSU's higher end subs above these models, so price should not always be a factor. You can also almost get 2 350's from the outlet for the price of 1 500. \:\)

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85