For me I just want to match it with the headlamps that's why I want whiter. LED's are cool but too expensive. I've never had super yellow foglights before too. I've also heard about higher wattages frying the main headlight system and it voids the warranty
As for shadowline, I'll probably wait after the 6 month period so I don't need to pay tax. With the FRT, it might come to about 12K. I want to change my kidney grills to matte black (although still can't find one) so it matches.