Help me get the most out of my Merlin TSM MX

I have had these incredible monitors for over a year and I am still enamoured with there balance and refinement. I am going to sell off my second system that doesn't get used anymore and I want to put the funds into the Merlin system. I should have $1000 to spend.
My current system is as follows: Merlin TSM MX on Skylan stands,DIY parts express sub with Behringer feedback destroyer for room eq, speaker wire is Monster M-series CX2( Paul Speltz Anti-Cables on the way), Cayin A 50-T 35watt el34 integratedwith a Virtual Dynamics power cord, Harmonic Technology Truthlink ic,Macbook Pro,Apogee Duet Dac. I use this in conjunction with a HT setup so I can control the sub via Ht remote from the B&K AVR 202.
I am not sure which direction to go. Do I get the "e" upgrade done by Bobby? Do I replace the Cayin with another integrated in the $1700 range Or get into separates? There is nothing that I don't like about my current system. I just want to take it to the next level of performance. I am not interested in a cd player. These monitors are capable in reference systems and that is why I bought them to build my system around. I might move up to the VSM one day so I want my components to be in place if/when that day comes.
Thank you for your opinions!
Bob