How about contacting a few owners to do a quarterly article on the trials and tribulations they've had operating their aircraft. It could be split into a few categories:
Multis - Apahe, Aztec, Seneca, Seminole, C-337 etc
Complex Singles - Arrow, Bonanza, Commanche, C-177 etc
Tourers - Archer/Warrior, C172/182, TB-9/10, AA5A/B, DR400 etc
Trainers - C150/2, Tomahawk, Robin(??) etc
Vintage - Cub, Taylorcraft, Auster, Tiger Moth etc
Fun (New) - Squalus, Foxbat (Aeroprakt NOT MiG!) etc
Fun (Old) - Pietenpol, FRED, VP-1/2, etc
Microlights - weightshift, 3-axis (don't know many microlight models sorry)
It might give potential owners a feel for what goes wrong with various types of aircraft and which group their style of flying fits with aircraft group. It might also help current owners to spot potential problems or sort out existing problems. This also creates a potential pool of contributors to the magazine whose style and ability is known.