Just to make some clarifications, the Quick Fire RAPID is the MX Blue board. The board with MX Browns is Quick Fire PRO.
And, of course, there is another MX Brown board from CM by the name of Storm Trigger. I actually have the CM Storm Trigger with me right now (I'm about to return it, however), but given that the OP seems to have decided on the WASD keyboard, I guess I'll pass on my impressions of the keyboard.
But just briefly, from the small time I've had with the CM Storm, and the small time I've had with a Filco a couple of years ago, I think the Filco had slightly better build quality (yes, even though they are both from Costar). But again, this is from very brief, superficial impressions.