I've spray painted my Polarg hyperwhite 1157 bulbs with high temperature silver paint by Rustoleam. The results are pretty good and they didn't fall apart or smoke up a storm when I installed them. This was a high wattage 35W bulb too, so it generated a lot of heat. I would highly recommend this spray paint for anyone wanting to get rid of that trace of bulb color that can be seen through the clear tails when the bulb is off. When the bulb is on, the color will still be the same.
Right now, I've upgraded my front turn signals to Polarg Visual series 1157 bulb which blinks hyperwhite but looks like a cool silver/mercury coated effect when it is off. Kinda like these new Raybrigs I guess. These Polargs weren't cheap though, like $20 per bulb. I suspect the Raybrigs would be similarly priced.
I've seen those APC bulbs at Pep boys before. The quality looked so-so, so I didn't even bother buying them. If you want to give them a try, you might as well. They're certainly the cheapest silver coated bulb option available.