Gah, I am terrible for asking a question and then going off and answering it myself... The stock master appears to be 16mm, so the PSC16 is likely the right unit. Which means the 19RCS is oversized - buuuut the AP Racing master is .875" which is ~22mm!
I doubt it matters much though, as I remember my first Monster stopped on a dime once I got the brakes sorted out (mostly a caliper rebuild, from memory).
Still leaning towards the 19RCS at the moment but I'm going to keep pondering as it's too late in the day to get one shipped.
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