Well, most of the time, I think the term "grail" is a bit overused in the collecting market. Having said that, I've just acquired what is as close to a grail piece as there is for me - the Stefano Caselli cover to Army of Darkness vs Hack/Slash #2.
Wrote a bit more about it in the description on CAF, but I'm a huge AoD and Hack/Slash fan and this is my absolute favourite Hack/Slash image to date. Soon as I saw a partial preview for it, I knew I'd have to have it. Without further ado, here it is (feel free to leave comments on CAF...haha):
http://www.comicartfans.com/galleryp...?piece=1050934.