Periphery outer ring thoughts ?

I use a peripheral ring on my Technics SL-1200G, and the sonic benefit is clear to me (along with a Stillpoints LP weight).  They couple the record better to the platter to drain away the spurious vibrations in the vinyl caused by the needle tracing the groove.  Prior to that I ran a SOTA Cosmos with vacuum hold down and reflex clamp, which achieved the same basic objective.   Using them brings a touch greater clarity in the subtle details of the recording, and a better overall frequency balance, IME.
Do make sure your table's bearing and motor are up to it.  With the Technics there is no question.

What periphery ring works with the SL 1200 G?

Two problems. They are a PITA to use and prevent use of an auto lifter.
They have to be heavy to work and this will increase wear on the bearing and motor which has to work harder to get up to speed.
Vacuum hold down is the best followed by reflex clamping as used by Kuzma, SME and Sota. Sota sells a wonderful reflex clamp for much less than a periphery ring. 

My ring is 2.5 pounds; it shouldn't cause problems for a competent bearing.   It works fine even on warped records.  So what if the electric motor works harder to get to speed?

Obviously vacuum hold down will accomplish a similar result.  But it seems that they are complicated and tend to break down.  Reflex clamps are a PITA, more so than a ring IMO.  I used one for many years before the ring.

As for an auto lifter, it may or may not fit.  It would fit on my TT.  But when I want to sleep to music I go digital.

My experience has led me to believe, using my two different tt designs that using an effective mat without a center clamp/weight let's the music becomes free with greater inner detail. Aforeunnoticed small details are heard. Bass sounds full, more real like it does live.