I don't really think that diesel is an option for the Morgan. The Maserati Ghibli is more of a touring car. In fact it is a slightly cut down Quattroporte.
It is very nice though and I am seriously considering buying one, however the current model is Euro 5 homologation and I will wait for the Euro 6 version.
The new Aero 8 is, I believe, the best looking and most refined Aero built to date. I think it will be a huge success for Morgan. The only thing that worries me is that they are steadilly moving focus to the GT market and developement of the sports car end of the market is essentially frozen. It also has to be admitted that by the time you option up a Roadster with leather seats, mohair hood, and a few other bits and pieces you are not far off the entry price for an Aero 8 and the Plus 8 seems to be very close.
I must admit that I still can't see why the use of the Ford V6 is not possible. It would probably require a different dash and some special electronic system to control the windows but the rest of it would seem to exist already (engine, gearbox, wiring design etc.)