Shunyata or Synergistic for power conditioning?

Sorry I cannot comment on the comparison but I own the 12UEF and could not be more pleased. However the Denali is also a very well reviewed unit and one I would be happy to own. Based solely on ease of use and my beliefs on synergy my advice would be that if you already have a lot of SR kit then go with the 12UEF but otherwise choose the Denali, if only for the plug supports which are a godsend, and something I have to improvise on my 12 UEF. One material consideration is that the Denalis do not come with a power cord, that actually makes them much more expensive if you do not have a spare suitable cord (in the $2-3K range) handy. Hope this helps. You can find my experience with the 12UEF here

Regarding the Dmitri -- it’s a good conditioner, I used to own one, but not in the same league as current models such as the 12UEF and the Denali. Also in my experience the Dmitri will not sound good with power amps if that is where you want to use it. If on the other hand you primarily want it for sources and get it 2nd hand (they are widely available) then it could work well. By the same token you can also get very good deals on second hand older models from SR and Shunyata as well ...

The Niagara is worth checking but substantially more expensive then the other two options -- I suspect all of these things cost more in Singapore where I think you are

In the US at least with the dealers I deal with they should be prepared to let you borrow the demo model and trial it at home, Bear in mind that with power components such as these it may take many days for them to settle -- every time I unplug my SR kit it takes at least 24-48 hours for the cables to settle in again (likely a result of the active shielding to reestablish). And of course unplugging and replugging your components is likely very awkward.

Thanks but Gospel may be taking it a bit too far 😇

Seriously hamburger as it seems you are new to the power conditioning business I’d buy second hand to start with, learn what works for you and then trade up from there. There’s next to no risk of getting a lemon when it comes to buying a power conditioner -- I’ve bought and sold many over the years. Buying new, especially without being able to compare, will simply mean you lose a load in depreciation straight away. And any money you save you can use to upgrade power cords (again the key is to find a line you like and move in that, the SR atmosphere cords are actually a good price and easy to use but unfortunately still rare used). I also like AQ WEL cords and you should see loads of these appear in the second hand market soon when AQ bring out their new power cord line