In addition to the upcoming Dash 8 Q400, another turbopropeller plane I suggest adding is the ATR 42-500.
First delivery was in October 1995, it has an increased take off weight when compared to its predecessors, allowing for more cargo and fuel for a range of 1500NM (2778km).
Its engines are two PW127E rotating two six bladed propellers.
Some of its users include:
Ohana by Hawaiian.
PIA Pakistan International Airways.
CSA Czech Airlines.
Air Antilles Express.
I searched, there are no topics on Features requesting the ATR 42-500.