The Nomad is far better than the twotter, as far as a scenic flying machine it is concerned, the only other aircraft you could use is a Dornier 228 (but then you need two pilots, and its a bit quick!). Everybody has a window seat (which is important in scenic flying - you don't want people leaning over someone just to get a view!)
To be honest after operating the Nomad along side the C208B, the Grand Caravan is not all that great an aeroplane (the two B17s in the Nomad burn the same as the PT6 does in an average flight for us). Removing the capital cost out of both aircraft, the Nomad still is cheaper to run per hour than the Caravan, and you have two extra seats to make $$ from (in our configuration anyway).
I would hate to see the Nomad with a PT6, a more powerful RR250 would be fine!
What sort of speed will the old Nomads do?
We flight plan for 150kts, and they're quite happy to truck on doing that.