Candidates for tonearm cable for phantom arm

Not sure what your price range is, but the Graham cable is good and I personally love the Purist Venastas or Purist Proteus Provectus...

does one need a right angle din to rca or just straight din to rca would be fine ?

Depending on your specific application, either or .... it's your call.

Silver Audio Silver Breeze - it replaced the Hovland MG2 in my system. Not sure about the need for a right angle DIN with the Raven One. The Silver Breeze is fairly thick and stiff up to the break-out (those last few inches of cable to the DIN). Max Kreifeldt at Silver Audio will customize the breakout to allow for a custom fit.

I've used both (on my former SME arm with similar style connector as your Graham). I think given the angle of the connector on the Graham arm, I'd for for a 90 degree. However, some cables like the Purist you can for straight (they have both options) b/c of the flexible lead out cable.

Zenieth's answer is it to be honest.