<p>If you need FA, it is very risky to apply ED. You simply will not be able to shop for aid packages, and you will have limited ability to negotiate.</p>
<p>You could safely apply to all your schools before you hear about ED, and negotiate your package at Cornell if you get in. Then, if you cannot get enough aid, you can get out of your ED commitment and still have your other apps in. However, it is messy, and you might have a problem if Cornell says its offer is enough and you are should not honorably back out of ED.</p>
<p>If you are competitive for ED at Cornell, then there are plenty of other places that will have you, and you might get merit money at some (not of course S or M).</p>
<p>If you really think your admission chances at S or M are in the low single digits, then it is sort of pointless to apply early. Use your early advantage, if you want, at some place that 1. might really admit you and 2. would give you a good aid package. (Not to say that the packages at S, M, or C will be bad, but they will not have merit money)</p>