CQ,
My two pennyworth....based on about 8 years of Morgan ownership, Roadster and then Aero Plus 8.
Williams: Recommended, particularly if you like good music and spaniels.
MSCC: like no other car club, small, imperfectly formed, but full of people who are more interested in their cars and driving them, than strategy and politics. BUT the membership is more focussed on trad chassis cars than Aero chassis or CX versions.
It is organised into Centres, each has a distinct personality. Try a number.
Choosing a Morgan: drive a number, remember they are hand built, unlike a Porsche, or anything else the side of the 1950s, so the driving experience will be different even if the model is the same. I drove 3 Plus 8s. One was just not nice, the second was too expensive and the third found me on a wet, miserable Saturday in November.
This place: possibly the nicest, most likeable forum I've ever been part of. Effectively self moderated, and the better for it: it works because a sizeable number of active members know each other in the real world, as well as the virtual world.
All that remains now is for your Morgan to find you.