From what I've read, Roy Gandy, CEO of Rega and prime mover behind the Rega RB tonearm series, is not fond of Sumiko high output moving coil carts. Gandy is a bit eccentric in some of his views and would have a strong opinion about his own cartridges designed for his tonearms (e.g., Elys, Exact).
The Rega 3-pt. mount MM carts screw right onto the RB tonearms and need no fidgety alignment process. I've heard the Exact on a P5 (or P7, forget which) and it was quite synergistic.
Another cart that reminds me of the Exact but can be had for less and of course requires standard mounting and alignment is the Audio Technica AT150MLX. You can currently get it for $325 from LPGear.
The Rega 3-pt. mount MM carts screw right onto the RB tonearms and need no fidgety alignment process. I've heard the Exact on a P5 (or P7, forget which) and it was quite synergistic.
Another cart that reminds me of the Exact but can be had for less and of course requires standard mounting and alignment is the Audio Technica AT150MLX. You can currently get it for $325 from LPGear.