Which phono preamps among these three?

I've heard the Chinook and Rhea, in systems I know well though not the same system. I've not compared them directly but did compare each to a (much costlier) Doshi Alaap. The statements below relate my impression of each vs. the Alaap. As a comparison this is unfair, but knowing how each performs against a higher fidelity standard might be useful. So, compared to an Alaap...

... the Chinook was highly susceptible to microphonic pickup and amplification of airborne vibrations. This happened with several different tube swaps. If we played the music at all loud, the Chinook inserted quite a bit of feedback-based mud. If one's setup permitted the Chinook to be isolated/protected from external sounds, including sounds emanating from the speakers, this would not be an issue, in which case the performance is pretty good.

... the Rhea's useability/adjustability are a joy but compared to the Alaap it sounded fairly muddy at all volumes. This was the original Rhea with the stock tubes.

Haven't heard the Whest. Hope this helps.

It's a testament to the experience and civility on this forum that comments like mine are followed by nuanced insights like the posts from Plato, Nestell, Jperry, Rwd and Lewm. On some forums, comments like mine might attract antagonism from outraged owners who won't tolerate anything but adulation of a favorite component.

Re-tubing or (especially) upgrades of pedestrian coupling caps would unquestionably improve the Rhea's clarity, speed and dynamics. Glad to hear that some have done so. I'd actually hoped that mentioning that I'd heard only the base/stock version would bring this out and you guys came through.

This thread demonstrates just how complex and individual audio improvements can become. It's either the bane of this hobby or one of its joys. ;-)