So many shows, so many choices.
Until anything better comes along (do you hear me, Whedon?) I think the programme I can watch repeatedly and still enjoy has to be Firefly.
Ask me tomorrow and it might be different although this one will always be a contender.
What I like about the show is the writing, the black humour, the characterisation and the shades of grey (apart from the humour obviously – that is definitely black).
I like the claustrophobic quality of the ship, the mix of high and low tech on planets, the mix of languages and the gradual revelation of back stories. It was a show cut bizarrely short, especially given some of the rivals that continued.
And finally someone who does space scenes without sound effects!