I never played the official one, which no longer exists. But I do have a very nice unofficial one. It really needs an official version.
Space Hulk has had a few, yet nothing compares to Space Hulk Tactics, which is not only the most faithful rendition, but actually an improvement on the original. Heresy, I know.
My biggest wishlist, and one that would be fucking nearly impossible due to the amount of permutations and variables, is Wiz-War. I would just sell the farm for a way to play that as a multiplayer video game, and guarantee I'd buy any system on day one which could accomplish this feat.
The following user(s) said Thank You: hotseatgames