I have the slowest of all MacBooks, the plain jane 1.83 ghz Core Duo white plastic one.
http://www.everymac.com/systems/apple/m ... _1.83.html
I maxed out its ram to 2 gb, but Logic still redlines the CPU pretty much constantly on any track with a reasonable number of channels and plugins running.
I dunno, I'm still on the fence about what to drop my money on at the moment. Once I sell all my DJ gear I'll have about $3k to spend, but I purchased all that stuff when I was working regularly, living at home, and not in school. These days, I have absolutely no disposable income. So once this $3k is spent, that's it for a long time. If I spring for an r16, as much as I want one, that'll be all my money sunk into one item. If anything ever happened to my laptop i'd probably be ratfucked. I've had this laptop for 3 years now, and the constant peaking of its CPU due to logic can't have been good for it as far as a heat standpoint goes. I guess taking another $600-800 in loans to get a used MB or MBP should something happen to this one wouldn't be the end of the world, but still. A zed would be great, but without a good computer for Logic I can do nothing.