Congrats. The X-2 crossovers are pretty good, and very high value. The real magic, though, is the 2Wq. IMHO, this sub may be the most underrated product in all of the high end. I like my pair so much that when I upgraded from my Vandy 1Cs, I made it a requirement that whatever speaker I chose had to work with the 2Wq subs. The bass is deep, fast, clean and smooth from octave-to-octave. They blend seemlessly with my Ohm Walsh 2000s. For sure, the lower crossover point will not be an issue with your 2CEs.
Remember that every bit of music in your system goes through those X-2s. I used my X-2s for a few years, and recently picked up a pair of the Vandersteen MHP-5 active high-pass filters. My system has taken another step up the performance ladder, with even smoother sound, more detail, better note trails, and an expanded, more stable sound stage. I got them used for $450 through Audiogon, and I could not be happier. I did have to have the batteries professionally changed, however, at an additional cost.
Although I still need to address some ancillary issues in my system (ICs, power cords, speaker cables, etc.), I feel as if I am getting to the point where I will have little desire for major upgrades unless I win the lottery.
If you'd ever like to come to New Jersey and hear my rig, you're welcome. Send me an email.
I have heard the newer Moscode amps, and if your 600 is at all similar to what I have heard, then I would think your system must kick butt as it is. Enjoy!
