Seeing that you've already acquired an Adcom amplifier, the Adcom GFP750 would seem to be a logical mate. I'm not sure how it compares to the Nikko, but it is very well worth the $6-700 you'll spend.
7 responses Add your response
Adcom 750 pre has my vote as well, if you want SS VTL has a well regarded entry level tube pre that does a good job... so does BAT. they go for about 900-1200 respectively.
speakerwise, as you have the SPL already, and not knowing budget or room parameters, perhaps Silverline Sonatina's? Phase Tech also makes some fine inexpensive speakers and have been making them for decades.