Last time a talked to National Flight about the -5 hot section cost they were from $75,000-$100,000 per side. It looks like the one in Montana will need hot sections in about 900 hours and will probably also need gear box overhauls, which i think are about $25,000-$30,000, but i could be wrong on that amount. Also the overhauls were $200,000-$225,000 per engine, but like Steve said you can find mid time -5 much cheaper than that. We have pretty much decided on the -10 but don't know yet if it will be a 690 or and 840. I did a demo flight in 73EF a couple weeks ago. Let me know if a can answer any questions about it.