A favorite brand of mine, especially the Alpha/Beta/Gamma series of seperates which are right up there with the best non loony stuff (especially the Gamma Tuners, though the amps will embarass a lot of the competition also). And the recievers of the XX19 series are possibly the handsomest recievers anyone ever made, to my eye (the Sansui 9090's feelings are hurt...), and are sensitive and sound good too. Their integrateds and tuners are attractive and solid also.
Keep in mind, though, that they have been out of the market for years and were never a major player, so repairs may be more complicated than for the better known brands (but prices are lower because Nikkos are less well known, so it may even out).