My list has the same episodes you mention, but with a couple of additions:
"Superman on Earth" - the origin episode with some wonderful scenes on Krypton and then later with the boy Clark Kent on the farm.
The sequence where an unbelievably young George Reeves leaves his parent's home is a classic. Seeing him get his job at the Daily Planet and meeting Perry, Lois, and Jimmy is also an absolute delight.
"All That Glitters" - the final episode, which, like "Perils," was directed by Reeves. That final scene, an interchange between Clark and Jimmy, is a beautifully bittersweet conclusion to the entire series.