Which edition of Beethoven's sonatas?

I want a dead-tree edition of Beethoven's piano sonatas for study. There are two grillion of them. Which one would you recommend? Acid-free (non-yellowing) paper and a binding that doesn't fall apart are much preferred.

Henle Urtext is probably one of the best. It is expensive but you get good binding and paper, These editions are admired for their clean engravings and researched of source material.

I second that, composerorganist. It is a bit more expensive, but look into it. Its definately a good investment. Get Henle Urtext.

Thanks. I found the first volume—it does look very goo.

You might also want to look into Edition K

I asked about K