Im not sure about solid white but you can take apart the devices and paint parts of them yourself.
Keep in mind that it MUST be glossy or clear coated or you will get dirt marks.I personally prefer mechanical keyboards, but not everyone does.
For me, the Ducky Shining takes the cake - Backlit in red/green/blue/white, comes in red/brown/black/blue switches.
From there I would look at Deck Legend boards, Filcos, and maybe on a budget the BW.
If you don't like Mech boards, the Logitech G19 is pretty neat.
ih well, I guess it doesn't exist :\ You had any experience with the sidewinder X4?