You have really good speakers currently, and for 10K I'd look at replacing your ARC front end with Ayre before going up to the Eidolons. Of the amps you've listed, the Ayre V-1 is far and away the most musical and best sounding IMO. Next, unless you are really happy with your LS15, the Ayre K-5x is much better sounding to my ears. You should be able to sell your ARC equipment for a little over $3K, and buy the V-1 and K-5 for around $7K, costing you $4K total.
And you will hear a noticeable improvement. I'm not sure what type of music you listen to, or if you require a phono stage, but you'd be amazed with how good your speakers sounded if you went that route.
And you will hear a noticeable improvement. I'm not sure what type of music you listen to, or if you require a phono stage, but you'd be amazed with how good your speakers sounded if you went that route.