I too like the look of the Commander to the point where I place it as one of the best looking Jeeps ever made. When making a buying decision 12 months ago i did my research and eventually decided not to buy one.
The main reason for this was the scarcity of the model in Australia. It wasn't a big seller and the possible delays in parts availability if broken down was a consideration combined with a general lack of mechanical knowledge of the car in the repair industry.
Re petrol or diesel. Given the diesel engine problems one reads about on the forums I would never contemplate owning a Jeep diesel and would prefer to tolerate the petrol running costs of a petrol powered car which in the Commanders case is the 5.7 litre V8. In the long run I think the petrol Commander may be overall cheaper to own than a diesel one.
Now the above is "my" common sense argument for not buying. My emotional argument for buying says that if this car [link below] was on offer when I was buying it would have been a close run thing as to whether it ended up in my drive way or not. Location in WA is a plus - no floods = reduced chance of it being a 'wet' car.
http://www.carsales.com.au/dealer/de...ck&sort=~Price
Good luck with your decision and purchase.