I can't even open a CSS patch with my macbook pro (i5 + 8GB), it crashes as soon as I load a patch. Don't know why, but i don't use it on this computer anyway. Works fine with CSSS though. I agree you should get one with 16GB Ram, and perhaps an i7 if you can afford it.
I contacted their support back when i had the same question for CSS. Here's what they told me :
"It's hard to be sure. We have had folks who have dual core Macbooks with the new i7 processors who've managed okay with high end sample libraries... we list quad core because you really need that to get the maximum benefit from the library's potential. However, I've checked with Alex and his feeling is that it will probably be fine if you use it lightly as described."
Don't know about Albion One and SCS, but i think it must be the same. You'll have to use them very lightly too, disabling mics/articulations you don't use and then it might be ok.