For the money...would not an L4 be a good compromise all the way around....good value for money...lots of spares...they go 100 hour to 100 hour...plenty of power in most applications...and nowhere the numbers of AD's SB's etc. Also ....no FADEC to worry about. Not as fast as the competition but the customer service issue is not a problem...your engineers already know the basic machine. Lots of the same spares....etc.