Which phono preamps among these three?

I hate it when an OP asks for opinions about a particular component or asks for comparisons between two or among three components, and THEN the responders suggest other completely different options. But, yes, I'm guilty. I agree with Shakey. You might take a look at the Maxxed Out.

Re the standard bone stock non-Signature version of the Rhea: I am a fairly advanced DIY guy. From where I sit, the Rhea uses pedestrian REL polypropylene and metallized polypropylene capacitors at critical points in the circuit. Indeed, my inherited Janus did not blow me away with its performance in a very full out system, albeit the Rhea seems to sport a more elaborate phono circuit than does the Janus. I probably heard it the way Doug describes it somewhere here. I then replaced the coupling capacitors of both the phono and line stages with some polystyrene film and foil types that were lying around in my stash of parts. The results were a revelation; in every way imaginable the sound was far better. So good that I decided to spend a little more money on Vcaps. There's not much else you can do to the Janus/Rhea because of its very sophisticated switching circuitry. So far as I can tell from photos, the main advantage of the Signature version is a capacitor upgrade. If you can afford it, go for that version. OR, get a competent tech to upgrade the capacitors in the plain Rhea. I think this latter strategy will go farther than tube rolling can ever take you, for less money.