Perhaps it depends on one's perception of ski Heaven - all pow in those fluffy clouds? Or even a spectacular carpet of corduroy instantly groomed to virgin purity by the Hosts. New knees may be awaiting in the hereafter. So perfectly formed and spaced bumps may be your pleasure. Those with a perverse penchant for blue ice boilerplate should look south.
For me, it would be the Blizzard Titan Cronus. It is a fine, well-mannered companion on virtually any surface. I have other skis in my quiver that are better in their own special way, but none so agreeeable and willing as the Titan's. It is a ski for all conditions and All of Time.
Oh, yes, and what boot fitter would you choose to have buried wtih you....