Hello Costanzia,
I'm in the same boat as the others who responded. The closest I can get is I did compare the ARC VT-200 to the BAT VK 60 mono-blocks and much preferred the BAT amps to the ARC. I have since moved on to the BAT 150se mono-block amps with the Eidolons and soon will be using the BAT 150se mono amps with the Eidolon Diamonds.
The CAT Jl2 and Eidolons from what I've heard is a great combination. I think the move to the ARC might be just a lateral move for you. You might want to look into the big Atma-Sphere OTL amps, or the big Joule OTL amps. Plus it is obvious I think the BAT 150se is a great combination with the Eidolon. Another consideration would be to upgrade to the Eidolon Diamond instead of an amp change.
Good luck to you in your search.
Tom