Long story short, I have the Xotic EP Booster on all the time and the Mesa's VTwin to dial the amount of distortion I need. It's the best guitar sound I had in years.
Funny thing, I use the EP Booster a lot with my DG30, too.
I wish I still had my V-Twin to try out with the amp. That was a super-nice box!
One thing I will say is that the fundamental nature of the two amps is (to my mind) very different. And I don't mean because one has two channels, and the other has one channel. The basic sounds you start with on each amp are different, before you dial in any grit at all.
The DG is a wonderful, beautiful sounding amp, but it's not easy to describe the tones. It doesn't fall into the usual Fender/Vox/Marshall/Mesa etc. descriptors. It does its own thing.
For example, the EL84s aren't your typical EL84s; they're 7149s, the military version the Russians used, and the plate voltage is cranked so that they need fans to keep from blowing up. This creates a very unique tone. The clean tone is thick enough to cut with a knife. The OD gives you not the typical overdriven Marshall or Mesa sound, but almost a halo of harmonics that seems to float above the notes.
I think the DG would be a nice compliment to your amp.
It's a different kind of amp to be sure, but I also think it's an amp an experienced player would get a lot out of.