Haven
Continuum
Orphan Black
Sleepy Hollow
Person of Interest
The Tomorrow People
Helix
Keep a look out for 'Captain Power and the Soldiers of the Future.' Yes, it's a children's show, but the head writer was J. Michael Straczynski, and was something of a tryout for 'Babylon 5.'
Also keep a look out for the Australian children's show, 'Ocean Girl,' which I believe is called 'Ocean Odyssey' outside Australia,
For something truly non-mainstream, watch 'Real Humans,' the Swedish science fiction series about a society with android servants (possibly being remade in English).
For a good laugh, watch some clips from the 1960s Australian science fiction series 'Phoenix Five' on Youtube.
Firefly
Haven
Outcast
Haven
The 4400
Sleepy Hollow
I have almost all good sci-fie tv show and I am now looking at some "non-mainstream" good tv shows to watch.
I mean, of coz, I have watched failling skies, eureka, fringe and futurama, etc., etc., etc.