We were recently quoted EUR 320k (which is around GBP 250k, or USD 400k at today's exchange rates.
For that price, or a little more, you can get an 1980's MD500D with over 10,000 hrs TTSN and 'average' component times. In a different thread somebody was saying that he or she is running the MD500 at direct operating costs no higher than a R22. Is that realistic?