Derek,
My suggestion hinges on what we accept as SR, if we go with a completely vague and ambiguous statement then I've made an essentially meaningless suggestion. We may, however, speak of SR:

• Ancestors
• Ascended Masters 
• Spiritual Guides
• God, Godde, Gods and Goddesses
• Nirvana, Sunyata
• Self-Enlightenment
• Etc.

This illustrative then points us in a direction and allows for a variety, hence we're able to move toward a "working definition".