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p.cs. I know I am trying to rush things, but I figure I might as well play and see what I can dig up until the pages are actually up there!
Its the norm to optimise your top level domain for the most popular (and normally more competitive) keywords as a TLD gets a typcially higher position in google so gives you and edge.
Less competitive secondary keywords can go on sub pages as a domain under the root will often carry adequate weight to get it in the top ten.