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My reasoning is that two 400's can provide continuous light in your whole grow area. While the 600 on the light mover works, and the center "crossover" area is gonna create dense buds and then the otside two feet on either side is gonna be getting the light for half the time the middle will. Causing those outside couple feet(both sides) to have less dense buds. While having constant coverage of the two may not give as dense of a bud as the middle of the 600 setup, they will be overall more uniform in density, which will probably put your yield up a little more.
-------------------- If you ain't smokin' dro, you're smokin' reggie.