Personally, I'd go with a PC slave before getting any mac to use as a slave machine. But my mac pro is handling everything I need, with my current setup it's plenty, I have no need for a slave machine.
@DG said:
Cyril, I'm not sure that there is anything to be patient for. Apple seems to have had very little response to the many complaints about the lack of performance using SSD with OSX. Also, now that Thunderbolt is out, I'm not sure that there is much incentive to do anything about it. I suspect that the full potential of SSD with OSX will only be seen with an external drive connected via Thunderbolt.
Apple is improving SSD support. Recently it was found that 10.7 has TRIM support, after that new MB air models included it for the latest version of 10.6 (in both cases, just for the apple SSDs but I expect that to get updated to support all).
In terms of performance on mac, it seems more dependent on the software. PLAY doesn't work well on SSD/Mac, and it sounds like the vienna stuff isn't really optimized for SSD on either platform. But Kontakt has major gains on SSD, mac and PC. That, along with major improvements on mac/ssd with other types of software, makes it seems like it's much more an issue for third party devs to fix than something on Apple's side.