I'm using a set of Arlen Ness Rad III mirrors. They work perfectly. I've had success with HD mirrors too, but I wanted a more aggressive look with the AN mirrors.
I have a set of Russ Wernimont Design (RWD) mirrors on my 15 RGS. You get the convex mirror, but without the fish eye in the HD Split Visions. At the tapered end the RWD's are slightly curved outward...covers my blind spot nicely. They also swing out a little more than stock. You can get them from J&P Cycles or Drag Specialties. The ones I have are J&P Part #752-364 and 365 at $50 each in chrome or black. The best bar mount convex's out there in my opinion.