Well Gojib has gone as far as Mexico city and trans Pacific etops Tokyo- Anchorage -Los Angeles this week so I think reliability is going rather well.
If you need 757 capability, there is only one choice...er...a 757. 737-700's come up a little short. BMI seem to like the idea.
Couple of 767 300 er's would be nice. If only we could find someone for them to play with.