Floor Standing Speakers That Would Sound Good With the NAD Integrated Amplifier.

Thanks for letting us know which NAD amp you have - the big one at 150 wpc into 8 or 4 ohms.  That leaves dozens and dozens to choose from that your NAD will properly drive.  And they all sound different!  Speakers are way too subjective for anyone to give you a meaningful recommendation from the internet - all you'll get is what someone already has or wants to have.

Again, do you have anywhere you can go to start auditioning speakers with music that you are very familiar with?  Make up a sort list of those models within your budget whose sound you like.  Good luck.

Give Ty Lashbrook with Tyler Acoustics a call. He's one of the "good guys" in the business. I own two sets of his speakers and they perform great with anything I have put in front of them.

I had a prior model in my prior "B" system. The C370 integrated, so I will comment on the bespoke NAD sonic signature from personal experience..... not just its strengths but also Its warts.

I heartily agree with the common themes in published reviews .... sample attached

http://www.techradar.com/reviews/audio-visual/hi-fi-and-audio/amplifiers/nad-c375bee-625300/review

AGAINST

-- Slight softness in midband
-- Lacks the polish to make the most of some high resolution speakers

I would not spend anymore on speakers than its max MSRP (past ) $1500 price-point (this model now discontinued ) simply because it planes out dramatically in its audio performance capability with speakers capped to its price strata,

IMO and my hands-on experience , doubling your speaker budget with this rig to $3K won’t help you.
As a personal experience comparison, I ran TOTEM ARROS and FORESTS simultaneously with the C370 . The FORESTS at more than double the price of the ARROS did not prevail at all.

In fact, I actually preferred the ARROs simply because it was a better match (for me) because of the "dark" and rolled-off top end audio signature of the NAD.

The FORESTs then mated with an ARCAM FMJ rig (much more $ inline with the FOREST price strata ) with a better detailed and airy sonic signature was the key to an audio performance step -up that the NAD could not deliver on.

Your takeaway IMO

I agree with Willand’s posted suggestion that the PSB speaker line (same distributor) will marry up much better with the NAD

FWIW

I completely agree with akg_ca in that with certain gear, particularly in the mid-hifi range, you'll reach a point of diminishing return when choosing speakers. I've experienced that with a couple of integrated amplifiers that I've owned in the < $1500 range and experimented with my own and friends' speakers, some of which were an order of magnitude more expensive than my integrated. They just sounded different and in some case better but not necessarily jaw dropping better. I must admit there was one exception and that was when I hooked it up to a pair of Charney Alerion single driver horn loaded speakers a friend of mine used to own and it simply blew me away. So I guess extra efficient speakers might not follow this logic. If it were me, I would reconsider my budget and audition as many speakers as possible before making a decision.