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I voted Mac Pro for production but its not exactly portable.
You can get up to 32GB RAM in those things and 2 Quad core processors. Checked out the cost of a max spec and its around £15k haha

my macbook crashed twice in a year and a half, just turned it on and it couldn't read the hard drive (both times). so i would advise a macbook pro.

yeah i've got to say the people who advise building your own PC and sticking linux on it or whatever are missing half the point of a Mac.

i got a white Macbook last year - my first Mac, and i'm well impressed with it. yeah it was more expensive than a comparable PC but the time it has saved me in terms of dicking around installing things is easily worth more than the extra money it costs. if you're just going to use it as a hobbyist machine then cool, get a PC, but if you're going to attempt to make a living with it, then it'll pay for itself.

well i got a macbook from lol: Argos.
2.4ghz duo
2gb - upgraded to 4gb for like £30 from overclockers
500gb hdd
got it for like.. £800
sexy sexy
just save some money for input devices heh
but yeh. good shit. so so powerful

Mac Pro for sure, but any Mac other than the minimac would probably work. Or build a Hackintosh. I have a Core 2 Duo 2.667 with 2GB(although I just upped it to 4GB over the weekend) of ram is what I've been using for a while and it was more than enough horsepower to run logic with quite a bit of effects. I don't use Sculpture or Delay Designer. Generally ES2 A few exs24's tons of busses and aux's 1 or 2 AU's like albino or whatever and loads of effects. Wave Editor was usually running too. Never even got close to half way. Sometimes one core would get around 1/4 and a little above. Ran very smooth

I've got a Macbook(2.0 duo with 2GB RAM) on the way though for when I go over to my girlfriends and want to write tunes. I don't anticipate any substantial performance loss.