Majestic National, a really good show that I got two pieces into last year. Take a look at the link and you can see them in the ad for this years show.
Westmorland Art Nationals, connected with a huge art fair this show gets many, many viewers.
MarinMOCA, Summer National Juried Exhibition, California. Establish a national reputation by getting into shows on the west coast!
7th Annual National Juried Show, Axis Gallery, California, this show has a really good juror from the San Fransico Museum of Modern Art.