^If you're caught up through Power Rangers in Space,
then it doesn't particularly matter where you start up next since every subsequent season was pretty self-contained. But everyone seems to love RPM.
There's a lot of crappy filler in the early seasons to avoid. Like, on Season 1, you can just skip over the 1st 20 or so episodes and start with the "Green with Evil" 5-parter.
Dammit, warn me before you post a video like that. I'm in the public library!