I just purchased a Macbook (white) 2.4ghz and i love it. But i have to have the new one!! Best Buy is letting me return it for the new ones when ever they decide to come in. My question is, will i notice a difference going from 2.4ghz down to 2.0?? (I'm planning on exchanging for the 2.0ghz aluminum model) I'm really worried this is something i might end up regretting. Any help would be greatly appreciated. Thanks in advance!