our kids were in the same position, we gave them a fixed budget which allowed them to attend their choice of school, any leftover money could be used (only) for grad school. One of the variables at play for us was the likelihood of acceptance based on something more granular than gross acceptance rates. We used naviance and parchment and created an ED vs regular probability score. for my youngest, the extra information was very useful in making her ED/vs no ED decision.
worth pointing out that she could apply ed 2 instead of ed 1. by that time, she may have her decisions and merit from the ea schools.