The eventual order should be split, either Boeing Narrowbodies and Airbus Widebodies or vice versa.
However for the immediate future they need good, reliable, "affordable" equipment on which to build upon. To this I would say they should consider planes parked in the boneyards that are in good shape and need a new airline, aircraft such as...
737-300s, 757-200s, 767-300s
Nothing bigger than a 767-300 for the immediate future, nothing older than a 737-300.
767-300 for flights to London, India etc..
737-300s for flights to Amman, Beirut, Riyadh, Dubai, Abu Dhabi, Kuwait City, Mosul, Basra, Istanbul etc..
Eastern Air lines flt # 701, EWR-MCO Boeing 757