I think the Harrier or Tornado would be an excellent choice.
For one they are older planes so its easier to get the technical details.
The "newer" planes like F18 are still covered with a veil of secrecy, wich results in a sim with ALOT of guess work and thus unrealistic.
The second point is that those planes are not crammed full with computers so its easier to implement in the state the sim is now.