Lots of great stuff here, but I've gone for five:
Dracula - Chris Lee
is Dracula. Nuff said.
Tales From The Crypt - By far the best anthology I've ever seen. Real comic book horror. Brilliant.
Frightmare - Fantastic. Totally unique feel to this. Sheila Keith is superb.
Satan's Slave - Excellent witchcraft tale. Another great performance from Michael Gough.
Plague Of The Zombies - One of the best ( and most influential ) zombie flicks ever made - and one of Hammer's very best, too.
Honourable mentions also go to
Curse Of Frankenstein,
Quatermass And The Pit and
Twins Of Evil among others.