A bit an answer of your concerns about wearing bright/white G-Shocks daily. I don't wear white ones daily, but my bright yellow Raysman is quiet often to find on my wrist for at least the past 5 years. It shows indeed some coloration. I took some pictures of it. The pictures are not small and normally you won't actually look to this discoloration (I live in the Netherlands, so I often have to wear long sleeves and thick coats to keep myself warm and dry outside), so when wearing I actually. There is some kind of bluish shine onthe watchband. Somehow the bezel looks still bright yellow.
I hope this helps in your desiccion to buy a White Fromgan and wear it or not.