This. SO this!

THIS. :rock:

I highly recommend Samurai Sentai Shinkenger.

Ironically, that's my favorite stuff. I don't like how they started using so much CGI when Gaoranger came out. I watch stuff like this for the suits.

As for newer stuff, I've heard that Dekaranger and Gekiranger are great, and i've heard good things about Shinkenger as well. I've only seen the first episode of Gekiranger, and it was pretty cool. Awesome suits and powers. The lead character was pretty high energy and goofy, but then again, it's hard to find newer Sentai that isn't very goofy. The more serious ones are the older ones.

IMO I really liked Dekaranger, Gekiranger, Shinkenger, Magiranger was pretty decent to me, Gokaiger was alright.

None of it to me is the "best" but in itself they are all so great.

You should start with Tensou Sentai Goseiger. It's an excellent series to pick up and enjoy. It has great characters, the best Other in Gosei Knight, the absolute best Sentai villain in Bureduran, and what's agreed to be the best Sentai team-up movie. Goseiger vs Shinkenger. And 199 Heroes.

You should start with either jyuken sentai gekiranger or kaizoku sentai gokaiger

Two excellent starting points. :D Especially Gokaiger. :D

If you're not into older stuff, you can't go wrong with the newer stuff. It's usually pretty excellent.

Since you've already seen Go-Busters, that leaves Shinkenger, Goseiger, Gokaiger, Kyoryuger, and ToQger. Of those, Gokaiger is the most consistently entertaining, but they're all high-quality shows.

Beyond these, you start venturing into SD series territory-- which, if you're like me, is best to do after you've developed an irrational love for the franchise, cause you're gonna need to forgive A LOT to enjoy them.

I feel like Gokaiger was a pretty terrible place to start, simply because of how often they change suits. Unless you're already familiar with the series and simply haven't watched any yet, it seems like the Gokai changes would just get annoying and make very little sense.