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I currently write music using ableton live and cubase... i have a stand alone pc (3gb, 512ram, 80g hard drive)... this is sufficient to run programs although cpu usage sometimes tops out... i want to use a laptop instead of this setup but need a high spec... im considering a mac book pro... but i know there are other options out there... i need this new laptop to out perform my curtrewnt cpu (but get the advantage of this being portable)... i will also buy a separate sound card.... any advice about what laptop to buy?

You should stick with a desktop for music production, they run about 3 to 4 times faster than laptops. you could get a 10,000 rpm hard drive in a laptop and it still would not be fast to do serious music ice.