Hi Everyone,
This is my current setup-ish haha (The Bifrost 2 is silver now and i’m lowkey regretting that decision lol) and I have couple other gears on the way so I’ll keep you guys posted.
Pi2AES > Bifrost 2 > Black Widow v2 > SW51+ > JAR650 | JAR600 (not pictured)
Pi2AES is the acrylic piece on top that basically works as a SPDIF transport. Bifrost 2 owners, if you’ve been only using Unison USB, definitely check this out. It has a cleaner, more incisive presentation than the Unison to my ears. I still appreciate the Unison though for convenience! I mainly use the Pi2AES to stream spotify on my iphone or ipad pro and it’s pretty nice not having to physically connect them to my rig 
Bifrost 2 …well I won’t really talk much about this since it’s been out for a while and I know a lot of you guys are rocking one for your rig haha good schiit, possibly my favorite schiit offering currently.
Black Widow v2: No longer being sold, but occasionally do pop up on the used market from time to time. It’s one of my favorite solid state amps, only bested by ECP 3F, but the price difference is lol It’s known for its warm and organic sound without the solid state etch/glare. Slams like a mofo and pairs really well with HD600 and HD800. I first heard it at a meet and was really impressed with its sound. Sometimes I do find the transients a bit blunted and the bass can sound slightly bloomy, but I find that you can ameliorate that with source matching a bit.
Shortest Way 51+: I think out of the many mid-tier tube amps I’ve tried (ZDT Jr., Liquid Platinum, Lyr 3, Valhalla 2, etc) this one takes the cake for the most bang for your buck, if your main headphones are high impedance dynamics. It pairs greatly with ZMFs and Sennheiser HD6x0 series. Despite being tube design, it’s very solid state sounding with incredible microdynamics and clarity. The aesthetics are very reminiscent of ZDT Jr. but the sound is quite different from one another. While ZDT Jr. is warmer, thicker, meatier sounding, SW51+ is “neutral-ish,” clean, and pristine sounding.
JAR650: Basically a 650+, that is less veiled, more dynamic, with slightly improved bass extension. As much as I enjoy Focal’s sense of dynamism, I always come back to the Sennheisers for the righteous timbre and do-no-wrong tonal balance. If you are a fan of the classics, this is definitely something you should check out!
JAR600: made by the same person but using the 600 instead. This one is more lively and share some similarities to Focal’s slightly aggressive sound. The uppermid shout is also lessened to a considerate amount and I find it more enjoyable/tolerable than stock HD600. I can see some people preferring this version over the 650 depending on synergy. low key, I’m still trying to decide which one to keep lol
I like using the JAR600 with the Black Widow and JAR650 with SW51+.