Great topic. As you can see from my sig, I am a poster child for ignoring the 1/3, 1/3, 1/3 rule and I have been politely chastised for it more than once.
As you would expect I entirely agee that spending the most on speakers makes sense within reason. You need to a least spend enough to buy quality electronics. I consider NAD to be good quality electronics.
I entirely disagree with the common statement that you should spend heavily on the amp and source because quality speakers will reveal the bad electronics. This is a non sequitar. What people are saying is, if you have a mediocre amp and cdp, better to buy cheap muffled speakers to mask the bad sound. LOL! No thanks, I'd rather hear the poor sound quality clearly via good speakers, then mask it with cheap speakers.
Also, I do not think that quality and price necessarily correspond among the various components. What I am I saying is that an 5 star amp does not necessarily cost the same as a 5 star speaker. So, in fact a better match might be had by ignoring price.
Also,if spend your money lopsided, it is cheaper to build a high end system. Take me as an example, if I want to eventually have a plinius level system, I only need to upgrade the amp and CDP, keeping my already great speakers, where someone that had split their budget equally 3 ways would have to upgrade all 3 components. Plus, while I'm saving up I get to enjoy the great speakers.