As I said Fred, if you're going super deep with the ST10, very NB (3nm) filters would make it perfect...
I agree too.. If I were imaging with a 2000+ mm focal length, and doing narrowband work, I would be going for an ST10XME.. And for sensitivity, the KAF-8300 has nothing on the KAF-3200ME. As you say though, Horses for courses!
Glad to hear you're running some images Fred!!