I think the best internal arm wire is the silver van den Hul MC-150S, I believe it is (go to their website and look at the cable info page) I had SME put it in my V tonearm two years ago (it's even better than SME's OEM vdH wire) and it made a huge difference.
Cartridges? I'm not going there . . . . . .
Cartridges? I'm not going there . . . . . .