I have an original black macbook. I love it of course but it is getting long in tooth and I have been doing much heavier Photoshop/InDesign work and I feel it is not up to the task anymore. I am going to buy either an iMac (because I also would need a new screen, this one is old too) or a Macbook Pro, I have one at work too so basically I could use my work laptop when I travel etc. Do you guys have an estimate when the Nehalem will trickle down to MBP's & iMacs? And will it be a significant upgrade to the existing core 2 considering all the advances in Snow Leopard? I can wait until SL but if there would not be _that_ much of a difference I'd like a new machine now.