I agree with jtwrace, you won't have a problem. In fact, I can't imagine a speaker that an ncore would have a problem with. Well, only case I could imagine is a high efficiency driver that the ncore might overdamp. Had that problem with an Aleph 30 when I was using a low-powered set-up. But other than overdamping (not an issue with Quads), ncores should have a problem with very very little in the speaker world.
However, there is a big gap between "not have a problem" and "best match for a specific speaker." I lean towards searching out the best possible amp-speaker match (which means audition, audition, audition), as opposed to getting an amp that can drive any speaker I throw at it without problems.