Check out the movie THEY. I actually enjoyed watching this movie. I feel most horror movies out today are overdone and boring, but this one seems different. Its more suspenceful then bloody, and it WILL make you jump.
The Ring is another good one like Earthy said. Especially if you have your freind prank call the house after you are done watching it. That should make your wife jump.
I used to be a horror film collector. The Italians, hands down made some of the best horror films out there. If you can find anything by Dario Argento you'll be in for a treat. Beyond was one of his better works. The old British Hammer films are always classics. Can't forget Lucio Fulci either. He made some classic horror films. Another good Argento film is Terror at the Opera. Mario Bava is another good Italian horror film maker.
There's a film called Black Christmas that my girlfiend got really spooked by. It's based on a sorority house and a maniac stalker/killer. Maniac is a good one, but it's more gore than suspense. Seriously, try to find some Argento films,they're some of the best out there. A side note- If you saw the movie xxx with Vin Diesel(I didn't) Dario Argentos daughter Asia is the co-star in that movie. There's some really great horror films out there if you can take the time to find them.
Are you guys talking about the US version of the Ring or the Japanese version(which is the original).
Carnival of Souls
Lord of Illusions
The Hills Have Eyes
The People Under the Stairs
The Serpent and the Rainbow
In the Mouth of Madness
Dawn of the Dead
The Texas Chainsaw Massacre
The Gates of Hell
Dr. Goldfoot and the Girl Bombs