Priority is getting more fame from Archdemon.
--spend 60k shards and double evo Ghoulem
--double evo Cupid
--double evo Succubus (5/5 revite)
I'd devo Ghoulem first, not because of AD, but for just about everything else.
Other than GH, I'd probably devo Cupid. Easy to get dupes (relatively speaking), used for all AD forms, and useful for more than just AD.
If you are planning on get more fame from Arch then you are most likely wasting your time.
How much fame do you currently get? 1k?
To move up the required 500 places and get another 200 you would need to do a whole lot more than devo a hero or two.