Siamese are the Chihuahua of cats. The stereotype is entirely accurate -- aloof, demanding and vocally shrill beyond any other breed I know.
I've been partial to Persians for almost 20 years. They're quiet, happy to remain indoors, and great with kids. Their downside is that they're rather high-maintenance. Grooming is a big issue, as is their inbreeding. Caveat emptor, but if you choose well, they're pretty awesome cats.
Jim