My Favorites:

Expandable:
Rocky Mt. Snyper
Rocky Mt. GAtor XP
Rage 2 Blade
Most Rocket heads

3 Blade Replaceable fixed:
G5 Stryker
Rocky Mt. Turbo (Blitz)
Muzzy MX3
NAP Nitron
WacEm

4 Blade Replaceable fixed:
Slick Trick
(The new Wacem 4 blade looks great)

Cut on Contact:
Muzzy Phantom
Magnus Stinger