Apart from the blu-ray version there is nothing better than the Ultimate Collector's Edition of Blade Runner. It comes with every released version of the film and includes the rare workprint version. It's stockfull of extras that run longer than all the films combined.
The extra stuff that comes with it are excellent. The concept art cards come in a neat folder and the art itself are spectacular and makes an excellent addition to any art collection. The holographic glass display plays a short 2 second clip by moving it up and down and is just plain awesome to put on display.
The police spinner and the silver unicorn are staples of the film and it's nice to have them embodied physically in your hands or your display shelf.
The suitcase itself is plastic and it's nice but there's nothing very special about it except for the Blade Runner logo, however it's what's inside that counts!