The new 08 GranTurismo is an automatic that can be shifted via paddles behind the wheel. However, it is an auto system complete with Torque Converter.
True manual and F1 may be an option later.
The 02-06 Maserati Coupes come in GT and CC. GT has 3 pedals and a stick shift, CC has F1 Transmission (paddle shifting that activates a clutch plate).
Best,
dsd