Guyver: The Bioboosted Armor:
Guyver may not be up some peoples ally. But, if you like ultra violence, evil monsters, an interesting story line, and awesome super suits. You really need to give this one a try.
The only con to Guyver the anime. IMO, is that they ended it early, years and years ago. However, the manga is still active. I am unsure how often a new chapter comes out though.