I bought a bum emac a week or so ago and the seller (our sons school) is letting us exchange it for another. They have 1.0 Ghz - 1.42 Ghz models. I'd especially like to avoid the 1.25 Ghz ones because of the capacitor issues, but the 1.42 Ghz would be pretty nice if I have the choice. Is there any difference on the outsides of the emacs to know which is which? I assume I'm going to a big room full of these and I'd like to be sure I pick the right one. Thanks.