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From GW.

Apparantly everyone except Nids and Grey knights can have Malific demon powers (and deamons get a bonus in being less likely to perils)

Likewise, everyone cept Nids and Deamons has access to Santic (and GK get a similar bonus).

Some deamons and GK get fluffy boosts, Nids get screwed...again

But GW has a cautionary word on that. You should think twice about casting deamonolgy powers if they don't match your armies fluff. Cos people might look at you bad. Thats the extent of balencing going on here then....