777 (Both 3-class and two class)
IAH-EWR
IAH-IAD

763 (3-class and two class)
EWR-ORD
ORD-EWR
IAH-SFO
IAH-LAX

764
IAH-EWR

787-8
IAH-DEN
DEN-IAH
IAH-LAX
LAX-IAH

787-9
IAH-SFO
SFO-IAH
IAH-DEN
DEN-IAH

747
ORD-SFO (Only very rarely during the Thanksgiving season some years, a single 744 flew rev ORD-SFO on November 30th, 2014)

Not all are regularly scheduled, but the most reliable I've seen is the 777s from IAH-IAD / EWR and the 787-8 from IAH-DEN and back.

-LPDAL