I can vouch for Drill Bits Unlimited as well, but their shipping rates keep Willem and a lot of others in the EU and the rest of the world from ordering from them. It's too bad there's not a clear equivalent "go to" source on the Continent, but maybe this thread will uncover one.
Slightly off the topic of the original question, but I'm a great believer in quality when it comes to drill bits. I had a bunch of cheap Chinese bits which were practically useless, they were "duller than hoes" as our saying here in New England goes. The DBU bits—even the resharpened ones—are sharp, and just like with a blade, the sharper the tool, the less effort is required to use it, and the less chance you have of marring your workpiece, or breaking the bit.
Just my US$ 0.02 worth :-)
Dutch