You could possibly clean the EGR first. It may not end up helping the problem but its worth a try before you spend that much money. If you did it yourself or had a friend who can work on cars, you could just remove two bolts and spray some carb cleaner in the EGR. For now, if the light bothers you, you could also just disconnect your battery cable for a few minutes, reconnect it and that will shut off the light. Theres a small chance it won't come back on but if it did it wouldn't hurt if you wanted to keep driving like that, you would just fail your next emissions test.