the good news is that this item has a pretty steady following of "experts"...the value is pretty much already known by those that buy pieces such as these...sure, you might get an auction bump, but the general range is already "known"...
that said, the last few mego hulk examples have sold for less than previous examples... (that's why I said a little soft).... high end collectibles require high end buyers...these, like in the comic hobby, are generally known (who the real players are)......
with ebay capping fees at $250, using morphy's or hakes will just be giving the auction houses more money, a seller of this piece will NOT benefit from them.... if she is not interested in a private sale (and I already know of several folks talking to her already), then ebay, no reserve auction is the way to go...