hehe .. you mention an interesting point. I actually intend to have the full 8 gig of ram in my laptop .. and basically having 2 gig set aside for Logic, OS, and other such things that need space. I have figured that my requirements for running a full orchestra is around the 5-6 gig region. This still leaves an adequate safety zone for running everything else.
I've been producing full orchestral work, with a few hic cups obviously, with only 4 gig of Ram on a 2.4 ghz Macbook Pro. And that has served me pretty well thus far. I now have a 3 ghz Macbook Pro (17 inch) that can take upto 8 gig and so if Logic will play ball then I should actually have everything I want on one machine.
64 bit I think would be icing on the cake, ensuring that the Ram cap is suitably higher. But I can work without it if need be.
Overall I'm not so charged up about Logic 9 as I see no big improvements to the Score editor .. which it seriously needs. Seems that all they've done is incorporate stuff from Garageband into Logic. I'm sure there are some good improvements but I'm thinking it may be time for me to move on to an actual score sequencer and use Logic 8 as an audio multitrack system.
What i'd give for the boys at VSL to produce a sequencer .. man that'd be f**king sweet.