I love my 6.2 diesel so far but as mac said do your research. I originally wanted to go with a Toyota or Isuzu but a 6.2 came along. I was originally against it because I had heard alot of horror stories as well but the 6.2 was very attractive because of the price and the fact that it is a conversion that has been done many times (in Australia anyway) I started do alot of research (diesel place, diesel page) both of these are great sites and provided me with tons of information. Most of the posters on those sites have nothing but great things to say about the engines. They are cheap because they were a mass produced engine sold in large numbers in the US, that combined with the military take-out engines flooding the market in the last couple years has kept the price down. You can't say just because they are inexpensive they aren't good engines, take for example the Mercedes 300 diesels. They are selling for less than the 6.2's but I doubt if you will find anyone in the world that says they are a bad engine.
Anyway, do your research, there are good things and bad things about all of the engines, your reason for choosing one may be different than others.
I chose the 6.2 because after researching it I arrived at the fact that it really is a great engine with a bad reputation, the engines are easy and inexpensive to find, all of the parts can be found at most any local auto parts store and there are conversion parts available for it.
Those were my reasons but with that said I would still love to do another swap with maybe an Isuzu or Toyota (if I could find one)
I mentioned in a previous thread about some sort of gathering of conversions, I still think this would be great for all of those interested to get a chance to see and drive the various engine choices. I would love to drive the Isuzu, Cummins and Toyota just to see the differences.
Rusty