I myself was looking for a decent priced amp for my NS10s a while ago and someone suggested the hafler p3500. I never got it. (my ns10s still sitting in the corner)
The NS-10 Hafler P3000 combo is not too bad on a budget. A little better would be a used Bryston 4B, a lot better is a Bryston 4B$$T (that's SST to be clear).
I second the Bryston 2B if you can find one. I bought one off a mate for about $500 and was just the ticket to make my NS10's come alive. I also run a cheap consumer sub with them...... I like it!
He's been begging me to sell it back to him ever since. Seems the Alesis "reference" amplifier he replaced it with has made his NS10's unuseable.
Here's a dumb question for you guys, since I"m in the same boat (my amp that's driving my NS-10's is awful, so I'm looking into either a Bryston 2b or 4b to replace them)..what's the easiest setup to control the volume of the power amp externally? What do most people do? On my amp, it's just a consumer line amp, so it has a big volume knob on it, but there is none for the Brystons. I'm trying to avoid buying an external mixer (unless I can bypass it completely and just use it to function as a volume knob)