Finding 1066mhz Rambus Ram is just about impossible right now. Some people have been able to get 800mhz Ram and overclock it to 1066mhz, but its a crap shoot. Once the ram companies starting making 1066mhz ram you can bet your ass its going to be expensive as hell.
Also, P4's at 533mhz fsb are hard to find, and are way over priced since retail supply is extremely limited. Basically, the P4 at 533 fsb w/ 1066mhz RAM platform doesn't quite exist yet except in the hands of a very few hardware review sites.