I'd also add Power Rangers in Space, Power Rangers Lost Galalxy, and Power Rangers Ninja Storm to that list of reccommendations.
Agreed on the first two; PRiS had one of the weakest overall Ranger teams in terms of acting ability, but a good storyline and an utterly epic climax. And LG suffered from some story incoherence in the back half, but it was a clever idea and had some nice subplots. I also kinda liked Lightspeed Rescue
But I hated Ninja Storm
. It was too goofy and its characters, both good and evil, were too annoying. I wasn't crazy about SPD
either; the concept was pretty imaginative, but I didn't like the cast and the writing didn't do much for me.
I did enjoy Dino Thunder, Mystic Force
, and Jungle Fury
-- solid middle-of-the-road seasons with likeable casts. And Dino Thunder
had probably my favorite Power Rangers