Hi Roger,
Just to add my two-penny-worth as a current 4/4 owner......
No. 16 - when you take a test drive, see if you can compare the 4/4 with a +4 - the 1.8 and 2.0 engines might make all the difference for you. And if you get an opportunity to test drive an Aero8, I recommend you do so, it'll change your view on Morgans forever!
To add another "cosmetic" item to your list - bonnet louvres - you might want to consider full-length bonnet louvres over the standard.
I wholeheartedly recommend that you pay a visit to the factory before you place your order - you will get a greater appreciation of the options available and even if you only have time to take a good look at the finished cars in the dispatch area, you will be seduced by the passion that is invested in these cars.
Best wishes,
Steve.
PS. We have the PVC hood on our 4/4 and it hasn't leaked once.