Colin
I've only just picked on this thread after 2 weeks in France in my 2003 - 4/4 (1800 Zetec)
As you will now have realised, chosing a Morgan can be a "challenge"
I am lucky enough to have driven most of the 4/4 and +4 range from recent years.
In summary:
4/4 Sigma - Lovely revvy engine; MX5 gearbox is a delight; lacks torque.
4/4 Zetec - Good solid engine; torquey; LT95 gearbox is somewhat "agricultural"
+4 Duratec - Smooth, even power delivery.
+4 Rover T16 - Good power delivery but dated and spares becoming increasingly difficult to obtain.
My choice? I would love to own a 4/4 Anniversary with the 2.0 litre Duratec.
My advice? Try as many as you can, because it is not just the engines that vary. You also have a choice of seats, hoods. bumpers; etc etc . . . but don't give up, because once you have made your choice you will love it.
Bud
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2003 - 4/4