I listened to the Rhea very briefly recently. Very impressive. Sorry, but I do not have any experience with the others.
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A friend has the Rhea. As Rwd says, "very impressive".
Benefits are: Very low noise floor. Fully adjustable gain and loading,
FROM A REMOTE!!!!
Can't get much better than that, can you?!
If you have the money, go for it is my recommendation.
Also, you rarely see these used, so you will probably have to buy it new.