The SA-750D is a very good arm and worked quite well with a Lyra Clavis da Capo. Not sure of the mass, but the Lyra is pretty demanding and requires a high mass arm, IIRC.
The Jelco 750 arm will see you through every upgrade you'll do. It's on the higher end of the mass spectrum so low to medium compliance cartridges will work well in it. I use a Decca/London Super Gold and it works brilliantly.
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