Rock what you already own.
I'd think that 9.5' is a good size for a 14-footer. Have your stern frame built with similar oarlock to oarlock spacing.
I have a Trib 13.0, and run 9.5' oars both with the 2-bay frame and my stern frame. 9' oars would probably be a bit better for both frames on this boat.
...but I also run the stern frame on my 15.5' boat and the 9.5' oars are great there.