Situated on the trendiest street in the city, Palace Nova Eastend Cinemas is an institution in Adelaide. The movies are different, the staff are friendly and with a fully licensed bar and intimate cinemas, this is a perfect starting point for any romantic adventure. The big draw of Palace Nova is the variation and quality of movies that are shown, there is always a movie playing that you've never heard of and rarely do you leave disappointed. Obviously the staff at the Palace are film buffs and a lot of care and thought goes into the choosing of the films they play, this is a refreshing change as they often take chances on independent films that larger chain cinemas do not.
If the Palace nova wasn't indie enough for you, the Mercury is the place to go. The variety in the films and there respective themes is unmatched as far as Adelaide is concerned. Their website describes the "Cinémathèque" as "a curated, year-long film festival which celebrates the best films of all time and pays tribute to the great actors, actresses and autuers" this means that admit one is a thing of the past. The minimum pricing to be a part of this amazing experience is $40 for adults or $30 dollars for concession this may seem expensive at first glance however this buys you a membership that spans over four films, do the math.
This membership system makes the Mercury Cinema one of the cheapest theatres in Adelaide, for example a yearly membership for $99 concession, averages out to $2.53 a film. The dedication to themes and particular era's makes this more of a class in film culture than a one off experience, for example the most recent theme "future imperfect" is a devoted to the films of the 70's and there bleak outlook on technology, the future and humanity. Sporting such masterpieces as Alien and Logan's Run, this provides the audience with a unique and memorable experience which seriously leaves you doubting the $19 you dropped last weekend on that 3D action flic.
A great quirky way to watch a movie on the big screen in Adelaide, with its cheap deals on Wednesday and its fantastic "eco tickets" policy where in if you have taken public transport to the event you get a 3 dollar discount this cinema makes for a affordable night out, that's rare amongst cinemas these days. Bean bags, a great atmosphere and reasonable drink prices make this a great movie going experience. Unfortunately the tickets do not go on sale until November, this is done however to avoid Adelaide's notorious cold snaps and unpredictable rain, making sure that no evenings are constantly interrupted by hazardous weather.
I'm disappointed that the Capri didn't make your list. It is more mainstream than the ones you highlighted, but is set in a beautiful old building, and the organ played before peak sessions is worth the price of admission.