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#241
Those are probably the best 2.
hmmm.....
Return to Ostagar was pretty good. Probably best for a Origins playthrough though, although you can use the armor and weapons you get in Awakening. (Calins and Duncans)
Witch Hunt is also pretty good, as it ties up loose ends with Morrigan, depending on the choices your character made.
Both are pretty short, about an Hour and a half, but if I was to choose 1 of the 2, it would probably be Witch Hunt.
(But mostly for the Story aspect of things)
It can be done before, or after Awakening.
I hear Lelanas Song is decent if you want to know her story before joing up with you. Never played it though.