Which Lyra Helicon?

Every low output MC is better than it's higher ' brother '.
Here it is the same.

But when you don't have a real good phono stage, I think, you will have more satisfaction with the high output Helikon.
Lyra systems are recommended with a MC 47K load, the next step for a phono section.

These systems are designed for serious users.

At .5mv sensitivity in MC mode the Grado phono stage is going to be a bad match to the lower output version and, depending on the rest of the system, and your sensitivity to noise, may even prove a problem with the higher output version. I think that in the price range the Phenomena could take either, but it's not my favorite cuppa tea. A better idea might be to use a MM phono stage, like the Grado in low gain and use an MC transformer ahead of it. Transformers are dead quiet and an excellent way to step up gain for a MC cartridge. Many of the nicer ones can be had quite inexpensively on this site. Just my 2 cents.

Is the SL ok with EAR 834p (68 db gain/47K load)?

Yes.
Should be silent.

( I need for my Miyabi ( 0.22mV ) 60 dB and 47k )