Like I said, Doctor Who is a ritual for me...I don't think the new stuff is all that fantastic, but the classic stuff is classic cheesy B-grade sci-fi.
And there's
loads of it (it has been running on and off since '63).
And I really liked the original BSG when I was a kid (got all that retail too).
As for sci-fi now, only really:
Defiance.
Doctor Who.
Continuum.
Revolution.
Warehouse 13.
idk about anything else
Terra Nova was another one that ran for a season and got killed back in 2011 (or something like that).
And there's Torchwood (which was a spin-off of "new" Doctor Who aimed at slightly older viewers).