@W3bbo:I have a Vaio as well, and have been thinking about getting a MacBook after going out NYE and seeing the DJ's with a couple of Macbooks. I don't think software like Ableton looks any better on either OS, but Apple have the benefit of people being confident enough that the software won't crash, mid performance. I have not had a BSOD yet on Windows 7 on several machines.
I am afraid that a Macbook would just gather dust for me, with Windows more of a workhorse. I need to pop into their shop as I have not been there for a while. Also their highest end Macbooks are entry level as far as most Windows hardware, but they seem to get 10 hours battery life and amazing performance.