Well, no one actually said that, because we don't know. My questions above were not loaded, they really are the parameters I use when I look at a speaker to determine its potential, before I've even heard it.
As to the best pair of speakers...you'll find there is no 'best' set of speakers for any given piece of gear. There are many variables in addition to the receiver/amp, including what kind of music you listen to at what volumes, space considerations, whether you like new or vintage gear, and last but not least, your own ears and preferences for sound which are different from many others'.
The best way to find out is to listen to as many systems as you can, and also do some reading here on AK. The Speaker Forum is a good place, as well as General.
Oh, regarding carts, I am no expert on that, find it very confusing, but read up over on the TT forum.
Welcome to the obsession.