Odai,
Moving away from the single-door issue, my recommendation is to pay only one subscription and go with the C172. The PA-28 and the C172 are both fine aircraft, but the Cessna wins hands down for passenger flying, because of the great downwards view. As a bonus, the annual subscription you saved buys you one more hour!
Concerning fire-extinguishers, I had to use one once. Not after a crash, but when trying to hand-prop a Citabria on a cold winter's day at a gliding club. I was in the cockpit and after numerous starting attempts, the engine backfired and a fire started in the cowling.
The thing I remember is how quickly it is possible to vacate the cockpit of a Citabria when you are motivated by adrenaline. I even remembered to take the extinguisher with me!
Last edited by India Four Two; 20th Jun 2013 at 04:25.