It all depends. For authors like Stepehen Kind, Dan Brown, James Rollins, I would pat hardcover prices to get the ebook the day it was released. After that I will pay paperback price. I understand that ebooks will take away profits from paper books sales so I am willing to pay the price.
For independent authors I hesitate to pay more than $5 on a book.
To me DRM is irrelevant in the decision.