I recently made my move and opted to buy a Zed Class D amp to run the system in my M3. It replaced my tried and true a/d/s PH30.2,
which was about 600 watts. Now I have 600 on my front 2-way and another 600 on just the subs. Wow, just wow is all I can say.
I waited till I had gotten an in car demo from my friend, and then waited until I saw the stellar review on Audio Gear to order.
Really happy I did.
Here is a link on the review if no one has posted it yet.