I've seen a couple of STS's with the white pearl, and I think they look really sharp. When i purchased my car I compromised on the color and got the silver because it was a good price. I wanted the white or a black one.
I have one as well, working at a Cadillac dealer you can imagine how often I come across the white pearl paint on numerous vehicles. To be honest as long as you have a good body guy you have no worries on matching the paint. Our guy charges about $100.00 more for matching the white pearl but believe me it's well worth it. So all in all it's actually not as bad as people make it out I be, just need to find somebody with the right experience.
And i hit a gator (18 wheeler tire recap)on the highway which busted my radiator and condensor and cracked my front bumper and made antifreeze get on my alternator then it started making a roaring noise so it eventually stopped charging, so i said since you have to paint the new bumper why not paint the grille like the 2000-2005 dts's and got the rear painted too. And had my wheels repainted because i painted them the first time and i guess i didnt leave enough flash time and they started to get dull after 2 weeks, hey it was my first time painting a 3 stage lol