Yeah B&K wouldn't hurt you any with the Def's. Still, dolar per dolar, the 2000's do great with Parasound gear! Forgiving, fullbodied, dynamic (yes, 200w would help your dynamics for midrange and treble), warm(which mates well with the Def's, which I've sold for years, as well as Parasound, and others), slightly forgiving on top(the Def's can be a tad bright/shrill on top sometimes, and the Parasound mates well here also).
Other options for cheep are considering Outlaw Separates for a song!.
More expensive to consider are Anthem, then Sunfire and Classe.
For the more essoteric, tubes actually sound great on the Def's!!!...no kidding!