I like the Bianchi best out of those 3, it rides fast and feels tight. The Fuji has some cheap, flexy parts on it and personally I hate the paint job. The KHS has a heavy, chunky feel to it. The Sugino cranks don't make up for the crappy headset and wheels.

I see a lot of bikeworks-built Olmos around, they're nice. You could also get a Benotto or DeBernardi for the same $. If you get a chance to drop by bikeworks (www.bikecult.com) check out the Nagasawa track bike... beautiful...