The main ones really are probably these:
Althelstan the Glorious
Henry Beauclerc
Henry Curtmantle
Edward Longshanks
Henry V
Edward IV
Elizabeth I
But as an honorable mention you have to have Alfred the Great because he not only theorised the whole concept of "England" he laid the ground work for it and was largely responsible for Althelstan being in a position to become the Glorious 1st King of England.
Post-1066 you use regnal numbers as well. Athelstan is a weaker choice, IMHO, than Alfred. Henry I and II were good, as was Edward I. Henry V... not so much; his wars were bad, bad bad for England, however often he won at the time. God only knows why you put Edward IV in (no, honestly, why?
). Liz was indeed awesome, but you could make a decent case for Henry VII as well. The Stuarts were indeed pretty much a chain of disasters.
No mention of Victoria? One of England's longest-serving monarchs; under her the British Empire reached its greatest height and kept the peace with her European neighbors for most of her long reign.
No mention of Victoria? One of England's longest-serving monarchs; under her the British Empire reached its greatest height and kept the peace with her European neighbors for most of her long reign.
I would add Charles II too, as a patron of the sciences.