Space Sheriffs were a substantial part of the Metal Heroes genre; Space Sheriff Gavan was the first show of the franchise. I'd never heard anything about an Americanization of any of the MH shows beyond the B-Fighters and Big Bad Beetleborgs, so if I missed on something...umm, whoops?

I definitely can't argue with your choice on OOO, that was a VERY good series! Plus, like I said, Birth is my favorite rider of all time. :D

And yeah, Den-O definitely got overmilked...if they're gonna keep doing that, I wish they'd just make a new series, this time focused on Kotaro/New Den-O. It'd be nice to see series based on some of the movie-only Riders, like New Den-O and Aqua. Aqua I think has some real potential...I mean, a water-themed Rider who's afraid of the water? There's a lot they could do with that, especially in the "unabashedly fun and weird" category. XD