I am also still a graduate student and graduating in may. I conctated chen and others last june and all the lawyers suggested i have good chance of approval and went ahead. I have heard of taylor, they might not have updated their fees on website so do double check with them. But if you happen to go with lawyers, Chen is the way to go and actually their fees are also consistent with many other lawyers. They file more than 2K NIW in a year with >99.6 approval rate. Did they give you the approved/refund ?