rJames probably came the closest possible to achieving this effect with samples. But honestly, I feel that this is one of those expressive sounds that can\'t be created convincingly with samples. Don\'t laugh, but here is my personal solution for getting sounds like this. Buy the $99 super-cheapo student violin, and multi-track them yourself, along with all the creepy scrapes, scratches, and buzzes you need. Anyone can make basic \"noises\" with a violin. This technique added an amazing level of richness and depth to my film scores.
There\'s an excellent composer named Florestan on the net who uses soundfonts and has a number of custom ones at his website. I remember once downloading a great psycho-like soundfont from his site that was VERY convincing. Don\'t remember what it was called. And I can\'t seem to find it -- I haven\'t used soundfonts in quite awhile.
I spent a long time a couple of years ago trying to do Psycho mock-ups as I had a copy of the score. I gave up. There was just too many repeated notes and different articulations. I love all these librarys but still some things are just not yet possible.
There are lots of people who don\'t like using various articulations. That\'s cool. But until modeling is more mature, you really need the right articulations (or live players) for certain musical styles and effects.
That said, when you can get away with only a single patch, use it to your best advantage!