Mk3? Yes, the 850 is the logical choice if you don't want to spend too much. I do believe that bkeske is correct about Origin Live. @millercarbon might know. Not sure what your longer term plinth plans are but going 12" will prove more satisfying in the long run.
Don't obsess about that 240 mm distance! Plus or minus 5 or so mm is inconsequential regarding distortion. For most tonearms the overhang is within 1or 2 mm! You cannot hear the difference! I owned a Jelco arm years ago when the company name was Koshin - the GST-1. $250 in 1978. The GST-801 was $500 then. I liked the SME-type adjustable base - made setting overhang easy!
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