In terms of really being scary or suspenseful, the first two that come to mind would be John Carpenter's the thing, and Stanley Kubrick's the shining. But I'm a big fan of old time Universal studios black-and-white horror films like the Wolf Man, the mummy, etc.. Films from that genre. However one of the few remakes that I think is good is the remake of the mummy. One of the reasons I think it's good is because it in no way attempted to copy the original. It took a completely different approach, and it worked. Also has excellent effects