Drive Driver... I don't care what the actual thing looks like when it's finally unveiled, just the name makes it the best. :lol

Your it is a really cool sounding name.

Kabuto zecter gets it for me... The sound is so awesome, especially Gatacks too.

RIDER KICK!!

For me it would be the W driver, and the Sengoku and Genesis Driver for their sleek designs and relaying on their henshin devices the gia memories and lockseeds to make most of the sounds. That aspect I love as it just gives them so much leeway with what they can do and they aren't forced to get all the sounds set in stone by the time the driver ships. I still love their designs in the show because they're simple, intuitive and not cumbersome.

A good henshin belt to me should satisfy most (if not all) of the following:

a) Looks cool, in
b) Streamlined/unobtrusive shape or design
c) Sound cool

I've only watched Heisei KR series, but based on the above, my favorites would be:

1) any Driver from Faiz = by far my favorite. Looks cool, is unobtrusive, is useful (phone and gun), and sounds absolutely badass. (STANDING BY... ... ... COMPLETE!)

2) DecaDriver = streamlined and unobtrusive, very cool open/close mechanism, and sounds pretty cool (D-D-D-D-DECADE!!!)

3) Kabuto Zecter = it's pretty sleek, nice metallic colors, and has a great voice (CAST OFF! CHANGE BEETLE!)

4) W Driver = I know this one doesn't really satisfy my criteria above, but I just really like this one. (CYCLONE! JOKAAAAA!)

5) Genesis Driver = I like this mainly because of the voice. Miki Shinichirou's voice is amazing for it. (LOCK ON!... SO-DAAAAAA!)

I like so many of them I can't even decide... x,D