Now, I'm a rabid horror movie fan. I pratically get high off the adrenaline.
I present to you...
Very two good unique Horror movies worth renting. Both. They're also good for those parents who don't want your children seeing nudity. These movies have none.
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The 16 and 15 year old sisters Ginger and Brigitte are doing their best to stay outsiders. The typical stupid foolin' around cheerleaders attracting testosterone-regulated boys are really turning them off. "Out by sixteen or dead in this scene - together forever" is their morbid pact - because what classmates or their own mother consider as "becoming a woman" seems to be the same as getting dumber due to hormonal alterations. So the wicked girls prefer to fake and imitate 1001 arts of dying for their school project, including decapitations and lawnmower-splattered bodies. But nothing can stop the disaster that is about to happen... While walking through the forest at night a petrifying beast, allured as Ginger is on the rag, attacks her. Since then, infected with the obsession for meat, Brigitte's sister turns more and more into a Vamp that picks up boys at daytime and eats the dogs of their hated classmates in the night. Ginger's escalating thirst for blood begins to get out of control and even her innocent sister Brigitte isn't able to stop her...
^ Taken from http://www.ginger-snaps.com/index.htmOne of my favorite horror movies of all time. The story is so unique, it's different from all others. Except one.

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Ginger Snaps- The Sequel" picks up almost immediately where the first installment ends, where Brigitte is cradling her dying older sister, who had become a werewolf. With Ginger now dead, Brigitte Fitzgerald (played by Emily Perkins in the original) is on the run from the Canadian suburb of Bailey Downs. Beginning the transformation herself, she has managed to stave off becoming a werewolf by injecting herself with a calculated dose of monkshood daily.
Becoming ill, Brigitte passes out on the street, waking up in a drug rehab for young women. Assuming her monkshood is a drug, the rehab center's supervisors have taken it away from her; without the daily doses, she starts going through the changes that had happened to her sister. Full of young addicts and kooky staff, she is befriended by a peculiar girl named Ghost at the hospital.
Like Brigitte in the first film, Ghost is a bright and nervous teenager, often shy around others. She appears to be a "normal" girl, but Ghost is holding a great deal of pain inside, as her grandmother is being treated in the adult side of the hospital for fifth degree burns. Unlike the other girls, Ghost is able to move freely within the center, a plot device that is central to the latter two acts' scenes.
^Taken from http://www.ginger-snaps.com/unleashed/home.htmThis is my favorite out of the 2, and my 2nd most favorite horror. The top 3 are the only movies that actually spooked me. Anyways, Bridgitte finds herself trapped in a Drug Rehab hospital. Awesomeness. The blood, guts, and the mental suspense they throw at you is unbelieveable.
Oh, and the Drug Rehab place? It was filmed in one of this town's local Hospital. Yes, people, that'd be Edmonton, AB. The Abandoned Underground hospital was also shot here.
Is there a prequel, you ask? Yes.
The whole thing was filmed in Fort Edmonton.
In conclusion, looking for a(or 2) great horror movie(s) to rent?
These two oughta do the trick. 
If you're asking which 3 are at the top of my Horror Movie list...it'd be this:
3 - Texas Chainsaw Massacre ( The new one, really didn't give me the creepers, but it's an all time favorite)
2 - Gingersnaps II Unleashed
1 - Amityville Horror (The one still in theaters)