Anyone know enough to list the difficulty of class epics in a rough order?

[Safon]

I've always been curious about how the epics stacked up against each other (as far as getting them) and how worth it each is to their class. If some of you are as bored as I, list the difficulty of acquiring each class' epic from easiest (top) to hardest (bottum), and if you're really bored do a second list with usefulness to class (top being most useful).

I'd love to see such a list! Sadly I have limited experience from live. Could get some interesting debate going on, or show some people uses for their epics they never considered before.