Collector's POV: I think that Sugimoto's seascapes will stand the test of time extremely well and will later be called some of the masterpieces of the last part of the 20th century. These large scale images are museum quality, period. At $450000 each, they're not cheap, especially in today's economic environment, but I hazard to guess that these works will hold their value like few others in contemporary photography. And at worst, you can stand in front of one of these images and repeatedly find something new for years to come.
There is a small accordion fold exhibition catalog available for $20.
The artist's web site can be found here.