if those items take a 9a fuse, you have your max figure
if you get a 60 or 80amp alternator, you'll have the minimum size you can get by with, doesn't take any electrical engineering .... look at your list, how much of that will be running at the same time? almost none - if you want some margin for all the bells and whistles, 100amp alternators are fairly common and not much more money
Bill
