Mmmm, How about kicker ZX550.2, it gives you 2 X 275(W) @ 2ohms and 2 X 205(W) @ 4ohms, so surely it can provide you the power you are lookin for at 3ohms.Currently running a JL 300/4 to my Z6's.. Although they sound amazing, can't help but think they can take alot more.
What amps can you guys suggest that provide a healthy 200w or more at 3 ohms ??