excellent then I can take the 30 off your hands
I think you'd be making a mistake getting the DG30. And you've stated why:
My old 20 watt Channel H was insanely loud...More of a concern is blowing the windows out of the house haha.
If you thought the 20 Watt Channel H was loud...the DG doesn't even START to sound its best until the Master is 2/3 of the way up, and it doesn't sound its very best until it's maxed at the normal setting, and nearly 4/5 up at the boost setting. In fact, it's too loud for me to run it in the studio at that 4/5 setting because it shakes the walls and ceiling too much (I like the Boost setting best because it's a little fatter).
But brother, that's
LOUD.
Yes, good. Oh, very good.
Wait, did I mention, the amp is loud?
Also, you have most preferred the Matchless Chieftain, the Matchless Clubman 30, and the Bad Cat. They are indeed great amps, but fundamentally very different from the DG30 in style and concept. I think their tone structure is more "crushed glass" on the top end, where the breakup of the DG30 is more "crunchy-crackly" on the top, and a lot fatter in the midrange, where the Matchless/Bad Cat amps tend to be a little leaner.
And as loud as they are, they actually don't need to be quite as loud as the DG30 to sound their best. (at least, that was my experience with my Bad Cat Hot Cat).
Whether they're any more versatile is another matter, Both the Matchless amps and the DG amp do a "thing" that either you love or not.
If the Matchless/Bad Cat tone is your thing, I don't see why you'd consider anything else.
I honestly think the DG30 is an old-school, play-out-with-a-band, play loud in a studio, Tweed-plus-who-knows-what flavored amp, that has its quirks unless you're prepared for some serious volume. But crank it up, and man, what a sound!
Also, the amp needs the matching DG 2x12 cab to sound its best even with the volume up, etc.
If you love, if you dig, the Grissom tones, that's what you get, 100%. But it's a specialty amp, designed with the input of a player who has a "thing" re: his tone. And if you're not in the mood for that "thing" on any given day, it's not happening with the DG30 without some tone shaping pedals. And...it's kind of fussy about its pedals. Some work really well, some not, though that's true of most amps.
My favorites with the DG have been the Suhr Kokoboost and Xotic EP Boost for clean boosts, the Xotic BB and Fulltone Plimsoul for overdrive, and the Suhr compressor; though the usual assortment of quality modulation and delay pedals have all been fine. The amp is less picky about its mod and delay pedals than its ODs and boosts.
That said, I LOVE my DG30 amp, and consider it essential to my rig. It's one of the two finest amps I've ever had in my studio, let alone owned. For a warm, midrange-oriented, roots sound, the DG is the real deal, but you have been forewarned about the volume and the need for pedals to vary the tone!
OTOH, if it's not going to be your only amp, if you're going to hang onto a more general-purpose, do-most-other-things amp like the Bogner you already have, then the DG would be a great choice if you can stand the volume, or don't mind an attenuator.