May I add here that a composite wooden-ply type arm-board seems to like the Rega arms IMO and that tightly coupling one to a metal plate may not be the answer for these.
I do disagree about the "badge factor" of the SME's though. I do agree that the cost is horrendous and the supplying dealers don't make a huge margin either (maybe the biggest ones do, but they are one or two in the UK I reckon), but there's something about the finish and handling pleasure of a SME 309, IV and V that is difficult to describe. I have used them in pre-Cirkus LP12's too to great effect and always preferred the SME V to an Ekos of any marque on these. I haven't tried an SME on a Cirkus LP12 but would hope it would be even better. I have no idea if there's an SME cut Keel (I very much doubt it?) but an SME cut Rubikon would be interesting I think...
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me