So A109 jockey then, Shytorque? 3000 hours between services is pretty good.
Tech specs on Pratt & Whitney engines:
PT6B and
PW200 Family from
Pratt&Whitney Canada 
Any particular preference on
Turbomeca Range Gomer Pylot? I'm guessing
RTM322
Shawn, electronic control is certainly cheap enough. There may be parts and certification considerations. Taken from
RR 250:
The latest FADEC-equipped Model 250 Series IV turboshaft family (Model 250-C30/C40/C47) spans 650-715shp (815shp thermodynamic), and powers the Bell 407/430/206L and MDH MD530/600N.
The trouble with Wankels is the same as 2-strokes, in that the seals passing over ports need lubricating so emissions suffer. While for example Mazda RX-8 is a very good engine, turbocharging is the most effective way to improve power-to-weight. To my mind high boost 4-stroke is the way to go for small powerplants (so piston is almost a turbine comb chamber). The reason i prefer diesel is because the fuel may be injected during combustion, allowing high pressures to be achieved for a given structure. Diesel partload efficiency is also higher than gas since the engine runs "lean", so there is no need to choke.
Mart