I feel like saying Black would be a bit redundant at this point, but meh. Kamen Rider Black.

I'm going with Kamen Rider Kabuto. Need an excuse to rewatch it again with the English Dub (which I don't recommend if you haven't seen it cause the video quality is terrible).

I would go with either OOO or Kiva... and nothing else.

I say either Black or ZyuRanger.

Actually, why not do Maskman since it was just completed?

B-Fighter Kabuto.

Not subbed.

Just one choice guys. Please narrow it down.
Like Dr Kain said, not subbed. Please limit choices to series that are fully subbed/dubbed.

Ineligible nominations like that will not be counted.

Then I say Black since you just did a Sentai series.

Alright then I'll go with Kiva.

For references, here's a quick list (I probably missed some).

Fully subbed Kamen Riders:
V3 (official US release)
Amazon
Black
Kuuga through current. (All of Heisei)

Fully subbed Super Sentai:
Sun Vulcan
Maskman
Liveman
Jetman
Zyuranger
Dairanger
Gaoranger
Dekaranger through current.
Akibaranger*

Others (Just a quick list of stuff on the major sites, probably far from complete):
Toei's Spiderman (It's on Marvel's website for free last I checked)
Android Kikaid/Kikaider (official US release)
Garo*
Garo Makai Senki*
DaiMajin Kanon*
Cutie Honey The Live*
Kodai Shoujo Dogu-Chan*
Madan Senki RyuKenDo
Tomica Hero Rescue Fire
Tomica Hero Rescue Force
GranSazer
JustiRiser
Sazer X
Vanny Knights
Masked Angel Rosetta
Lion Maru G
Zebraman 2

* Ones I know are intended for an adult audience.

English shows:
Power Rangers*
Mystic Knights of Tir Na Nog**
Masked Rider**
Ninja Turtles The Next Mutation*
VR Troopers*
Big Bad Beetleborgs*
Superhuman Samurai Syber-Squad
Tattooed Teenage Alien Fighters
The amazingly awful Dynaman dub.

*On Netflix and/or DVD
**Good quality might be hard.

I'm sure I'm missing a lot of Ultraman.