Mac OS X 10.9 (Maverick) and mac recommendations

Hi Marianna (and other forummemebers),

We're in the middle of building a new edit suite with MC7 and eagerly waiting for the MC7 update that makes an end to the Mavericks issues. Until now we've used MC on PC, but we want to make the switch to mac. And we are going to use artist mix and artist control and aja i/o. So should the new update also make an end to Mavericks issues with Artist mix and control?
What apple system would you recommend: imac i5/i7 or new upcoming Mac Pro? Is the Mac Pro going to be noticable faster and smoother with MC7? I ask the question cause several people told me that MC isn't using the mulitple cores of multiple processor systems optimal. So a mxed out system seems to be throwing money out the door. Any useful advice? Thanks in advance.

Tx in advance