HP Tech Solutions is the pretty big (but relatively new) IT consulting branch of HP, headquartered in Palo Alto. You also have CSC (Computer Sciences Corp), headquartered near LA. Not sure of what else is headquartered out on the west coast, but there are companies from all over the world that recruit at top U.S. universities. Infosys, for example, is headquartered in Bangalore, India but actively recruits at top U.S. schools. Accenture is also huge for recruitment in the U.S., but is headquartered in Bermuda. Your best bet will be checking out lists of companies at the school's career fair to see what kind of exposure you'll get.
Here's a list you might be interested in:
http://en.wikipedia.org/wiki/IT_consulting