Can someone advise on the best videos in this series please.

There are so many to choose from - depends on your own particular interests in magic. Some are magician-specific (like Tomsoni, Shimade, Bobo), some are trick-specific (like Linking rings, Cups and balls, anderson newspaper tear)and some are genre-specific (restaurant, bar, comedy).
Best bet would be to check out the contents of each of them on the Stevens website.