I would love to see new episodes of Sapphire & Steel, a Sci-Fi/Fantasy show from the early 80's. I have all six adventures on DVD and I watch them over and again whenever I want a challenging show. Unlike most 80's TV shows, it's not exactly good guys verses bad guys, because I wouldn't call Steel (played by David McCallum) a good guy. He's an agent of an unnamed organisation whose job is to stop time breaking through and doing damage in the universe and he will do whatever is necessary to achieve that aim. Sapphire (played by Joanna Lumley) is his partner, a warmer character with a conscience, but she takes Steel's lead.
It would be a perfect series to bring back for the modern era, it wouldn't need much revamping, since it already has a very modern feel to its writing not being so cut and dried about good and evil and examining a situation practically. I'm thinking that Tom Hiddleston would make a good Steel, he has the right mix of cool Britishness and bite, you could be rooting for him and slightly afraid of him at the same time. Gemma Arterton, or maybe Billie Piper would make excellent Sapphires, mature enough to hold their own against Steel, but with a soft side as well.
Any favourites you'd like to see with new eps?