FWIW, a T-34 probably costs less/hour than a -57/67. I don't know the numbers for the Jet Ranger, but the Weiner is only a couple hundred an hour. I had the number before but lost it. I'll have find that again. I was amazed at how cheap they are.
Considering maintenance, agree. Gas, however, was cheap 30 gal/hr in the -57. -67 is a "206L" model though with different engine I believe...probably a little pricer...
You can rent a 206B for about $300-$350 sans instructor.