All I can remember is that the people chosen for the job all have fatal diseases and are chosen because they will die anyway, one has hiv, one cancer etc

Its more than 10 years old I think, I remember one guy getting hiv from sharing needles and blames homosexuals for creating the disease at the end he doses up massively on acid and shoots another member in confusion

And no its not things to do in denver when you're dead although I believe one of the cast from that may have been the afforementioned junkie in this film but I may be wrong

That sounds like a really encouraging movie. No wonder you want to see it again ~!

The movie was interesting, not all films make for a happy story, thanks a lot for wasting my answer though

HI Buggs83UK - I'm thinking you might be looking for this:
The Immortals (1995) - IMDb (http://www.imdb.com/title/tt0113394/)
(I have not seen it, but William Forsythe is in it as well as in Things to Do in Denver When You're Dead, and upon looking at the plot keywords for the Immortals, I think it might be your movie.
The Immortals (1995) - Plot keywords - IMDb (http://www.imdb.com/title/tt0113394/keywords?ref_=tt_stry_kw) )