I've been pondering the same question with my 350. When I bought my setup, they didn't have the 500 or 600 out yet. I'd like to know if I should get a second 350, or a 500 to go with my 350. My guess is that it has been to long to upgrade my 350 to a 500 or 600....

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