Bryston 4B3 vs Mac MC462 vs Pass Labs X250.8, OR... GRYPHON Diablo 300?

Bass resonance must be present if recorded, just as body and resonance of other instruments in other frequencies. It should not be bloated unless, again, that's how it was recorded.
Yeah, as I like to think, the biggest audiophile mistake is not to spend enough, and second biggest one is to spend too much. You just have to define it in each case.
You mentioned possible great turntable in the future. Some will say that there are great $5k turntables while others will say that there is nothing great under $50k. Gryphon phono should be adequate for $5k table /arm plus up to $2k cartridge set up. But if you go higher, yes, no choice but have separate phono.

When the time is right, I’d guess my budget for a turntable would be up to $12K.  But that could all change once I start exploring that avenue further and I become better acquainted with the options....

But after this purchase I doubt that will be happening for 1-3 years!  

I also need to consider whether I’m happy continuing using my Mac Mini with Audirvana as my digital music streamer or whether I’d like to get a dedicated streamer at some point.  I’m not sure how much difference something like an Aurender or even one of Simaudio’s streamers will make vs my Mac Mini.  I’ve got a decent AudioQuest Diamond USB cable and also a JitterBug anti-jitter device (which I have not tried yet).  I have trouble spending a lot on a dedicated streamer considering how quickly technology will render it obsolete, despite firmware upgrades etc.  I worry about that for DAC’s as well, as even that technology is changing in terms of supported formats.  Gryphon’s documentation for the Diablo DAC module expects users will be connecting to a computer, so I’m hoping that’s a sign that my Mac Mini should be sufficient.  If Gryphon assumes use of a computer as a streamer for their DAC, that must be a sign it’s acceptable!  

I know virtually nothing about digital, I did hear something about Aurender and PS Audio streamers, something good, I just don't remember what exactly I heard. I mean heard from serious audiophiles.
As far as turntables go, $12k for table/arm plus cartridge would be an excellent set up, high level. Whether you choose warmer sounding, say, Nottingham Analogue or Pear Audio turntables or colder more neutral sounding, say, SME or Kuzma or Simon Yorke turntables, everything should be matched as much as possible, not just electrically and mechanically but also musically. Gryphon's onboard phono could be a good starting point but you would want to go higher or both higher and with tubes. I read somewhere that Gryphon's own separate phono is great but very expensive. 
Of course, Gryphon expects the use of a computer as a source but not only, they are well aware that many audiophiles keep playing cds. So with both phono and dac onboard you just need sources, speakers and a few cables, the Diablo will take care of the rest. Oh yes, and the wall current.

I get your concerns over repairs and the dealer’s response, but I am in a similar boat with my Symphonic Line electronics from Germany. This fall I had an output board fry in the CDP/DAC (ooo-oooh that smell, can’t you smell that smell?). The solution was to send me a new one to plug in, and all was well. To be honest, I actually preferred DIY to entrusting it to FedEx or UPS.

Hi Guy's,
Interesting thread you have started on the Gryphon Diablo 300.

I have just ordered a Diablo 300. No dac or phono module, as I am all digital with a very good dac I am happy with. I may entertain Gryphon's dac module down the road, but we will see. My dac is out getting upgraded at the moment to their latest  spec in the UK. Both pieces should back and here maybe this week or next. The only other thing is I have to go out of town for a couple of weeks beginning of March as things arrive.  :(

I did not have the luxury of auditioning the Gryphon Diablo 300 prior, in my area. I know I know, but unless you have that exact piece in your environment, with your speakers, etc, it is a guessing game with synergy....
I am down sizing from  McIntosh Mc501 mono blocks, and there two piece C500t preamp. I had these mated to my PMC Ib2i's. This system sang, and I would have kept it, but the sprawl of everything needed to go as my room and setup is different now since I moved. I wanted a top end integrated amplifier. Hence the Diablo 300.

Nyev, your concern's about repair are perhaps warranted, but over thought or worrying too much in my opinion. When you get into this caliber of components, with military spec boards and top selected components, repair will be negligible if any in my opinion. World wide shipping works now a days as repair depot's are not on every corner from most upscale brands anyway. The cost of doing business "if" needed. As you mentioned the dealer sent their unit in and nothing was amiss. That dealer was pushing that amp and doing usual things with it anyway.

So....order, enjoy, and don't look back.