In reply to Leonard Tedd:
Hmm - not climbed, not even googled. I must be in the dark a little here.
At a guess I'd say October / November are best for summit attempts in Nepal that are trek based so September may be a little early: have you checked out exodus or somewhere? They may have a route / date plan you could work to.
Any issues with getting a visa? I've heard it's been a bit hit and miss!
I hope someone more knowledgeable can assist
