Gryphon Diablo 300 vs Vitus RI-101

   So I've been itching to upgrade my amp. I currently have: PS audio Directstream -> PS BHK preamp -> parasound JC1 -> Focal Sopra 2.
    I narrow down to these 2 candidates. Any one with experience with both int amps can comment on them?Thanks!!!

You mentioned earlier in your post that Naim has no present here in the US. That isn't true. 
Fyi, Naim has lots of dealers here in the US. Where do you live? I live in Seattle, WA and we have several Naim dealers here in the area (5 Naim dealers in our greater Seattle area), 3 in proper Seattle WA; 1 in Bellevue WA; 1 in Bellingham WA, 1 in Tacoma WA.
I don't post terribly often but thought I would as I have the Gryphon 300 and had the JC1s. I have also had the pleasure of the Pass 150.8 in my home. All 3 are really nice amps but each brings its own flavor. To me, the Gryphon 300 is a bottom up, big sounding amp yet it also has a really nice tone the high frequencies. I think it also has the best imaging. It's super easy to want to turn up the volume yet not have any fatigue. The JC1s are really even handed from top to bottom and don't seem to emphasize any one thing over another. For the price you can get a pair of them for, they are really hard to beat. They sound impressively better set to high bias and with updated cords. The Pass 150.8 really shined through the midrange but didn't sound as refined as the 300 at either frequency extreme. I've not heard the Vitus but when it sounds like their gear is best <50watts Class A. Beyond that and it seems like there are a lot of mixed reviews. 
FWIW - the 300 sounds so good that it has prompted me to start looking at its bigger brothers - hard to give it a better compliment than that!
@caphill nice collection and great feedback on the Naim gear. I have always wanted to hear some of the amps; I was really curious about the Super Nait integrated some time ago; In looking at the insides of the units from the glorious world of Google pics, I am impressed that Naim seems to squeeze so much sound (statement based on numerous glowing reviews only!) out of compact implementations. In addition to the novel gain stage topology, I do like the idea of a single pair of push/pull devices; less matching headaches for one, and less expense overall. I like that they use the bottom plate of the chassis as heatsink; Very tidy. Perhaps someday I shall have a listen. I imagine that a Super Nait plus, say Dynaudio Special 40’s, would make a wonderful high value excellent sounding system.
Cheers and have a great weekend.

@koslekt1 - great info on that post. I see you have your Diablo 300 for sale (hint, hint btbluesky).

If you decide to with the Naim Super Nait I would highly recommend using Naim streamer/DAC and use DIN connection. Naim electronics sound their best when using Naim’s proprietary DIN connections, with the exception of Naim Statement gears which provide DIN, XLR balanced & RCA single-ended analog connectivities. But all other Naim components other than the Statement gears only provide DIN & RCA single ended connectivities. DIN is basically Naim’s simplified version of their XLR balanced analog connectivity.

Instead of getting the Super Nait and Naim streamer/DAC, I highly recommend the Naim Uniti Nova all-in-one box solution. The Uniti Nova is a streamer/DAC/integrated amp all in a single chassis. The Uniti Nova sounding superb very musical and very refined smooth warm (intoxicated warmth) punchy full body sound and music sounded very natural & organic with excellent PRAT. With the Uniti Nova you could save on analog interconnects / DIN and power cables, and save space.
You can read glowing reviews on the Naim Uniti Nova. It retails for $7500. Its onboard streamer/DAC/clock is superb. Got built-in Tidal streaming app and is Roon ready. You will be surprised the sonic quality and performance you can get out of that compact single box called the Uniti Nova.