There's no particular need to match an amp to a particular pair of speakers,
A high quality amp will make even trashy speakers sound better than a cheap amp.
You might want to reconsider the NS-10's though, the story is that the original NS-10's were bought by a recording engineer to listen to a mix through a couple of cheap home stereo speakers. A number of studios followed suite, and since the NS-10's had those distinctive black boxes with bright white speakers, every time some super high end studio photograph showed up in a magazine, those NS-10's were right there in your face. People started to assume that NS-10's must be awesome speakers cause "every pro studio uses them!".
So, not to claim that NS-10's are utter garbage (although lots of people claim so) it's just that they are supposedly ordinary stereo speakers, and not worth what people are willing to pay for them. IE any reasonably priced home bookshelf speakers would do the same or better job.
I bumped into this thread actually trying to track down anything about Yamaha NS-30X that a guy locally wants to sell, (The pair for $240 Canadian) but there is an unbeleivably low amount of info about them on the web, so I have no real idea if the NS-30X's are also junk, or reasonably good bookshelf speakers, or an amazing deal.. I'll probably pass on them, since I would assume replacement parts would be hard to come by (Apparently the NS-30X are only sold in Japan).