Dude, don't go from Kuuga to Gaim. Try Kiva or another series like it.
I'm watching the whole Heisei Era xD I have 16 seasons of this to get through.
Also, Drake, I wasn't able to go into details before because I was on my phone. If you're looking for actually good modern Power Rangers, definitely try RPM. It's the pinnacle of the series in my opinion. Good writing, good characters, great effects and fight scenes, cool theme (aside from the out of place vehicles), and it's quite dark at times without seeming 3edgy5me. All the Rangers were important, not just Red, they all had a fairly unique character (Red was a bit weaker, ironically), and most of the side characters were important and got screen time as well. It's impossible to get away from the occasional bit of silliness, since ya work with the footage Sentai gives ya (a soda based monster showing up in a post apocalypse setting is just stupid), but so much of the footage is original American stuff and the storyline is so different to the Sentai that you could watch this even if you were a Sentai fan.
I've actually spoken with a few Sentai fans who have a pretty low opinion of Power Rangers who said that RPM was a superior show to Go Onger (or whatever the fuck the original Sentai is called).
Definitely give it a try, just forgive the awful intro.