I am not really into horror TV series but still there is a few gems among them
#1 - Supernatural - Best show on tv
#2 - The Walking Dead -
#3 - Bates Motel - Didn´t think much of this at first but then i got hooked
#4 - Angel -
#5 - Buffy -
And of course X-Files & Silver Fang (if these count )