I am interested in doing the following route on a OW Business award

TLV-PEK, HKG-SEA, SEA-NYC, NYC-MAN, MAN-TLV

1. My calculation put this at between 16-17K miles which would be a 130K mile award. Am I right?

2. The rules say that you can't use BA for non stop flights across the Atlantic. Is SEA-MAN with a connection in LHR considered an OK flight?

3. Which airlines are the best for this route?
I assume SEA-NYC would be AA, NYC-MAN, AA/BA connection & MAN-TLV, BA.
What would be best for TLV-PEK and HKK-SEA

I thank you all in advance for any input