I have same setup so don’t worry to get good performance by apple macbook pros. You will have problem-less configuration. It’s Steinberg’s problem if cubase 6 has issues with new 2011 macbook pros and they have to update it. I use to work with 20-30 channels full with fx and instruments. It’s working well. Ps: I haven’t tested cubase 6 with extremly big project on macbook pro for example rock bands, pop songs etc. I produce techno with 20-30 channels.