Hmmm, not sure about the power levels of other warp entities (although my take is that given the nature of the warp, anything has the potential to be as powerful as is immaterially possible given the right circumstances).
On the daemon front, Dark Eldar are odd. Ostensibly, they're very wary of psykers and anything warpy in the Dark City as it would draw the attentions of Slaanesh. Also, they're psychically atrophied so are probably unable to draw enough power from the warp to summon daemons (although the Path series does indicate that this can be reversed).
However, they can field a number of daemonic units. Khymaerae are low-level daemonic warp predators that are captured by Dark Eldar Beastmasters. Also, Mandrakes are quasi-daemonic Dark Eldar/Daemon hybrids of mysterious origin. They don't appear to be warp-connected daemons, instead drawing power from an entirely different shadowy dimension. However, there is a short story where they side with Nurgle and try to invade Commorragh.
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