I've been hearing a lot of good things about Silver Xtreme bulbs lately. They're silver coated amber bulbs that replace all signal and side marker bulbs.
I found them on: www.visionbulbs.com
The site is really cool because all you do is go to the store, select the type of light (eg. front signal), and they will send you the format of bulb that you need.
I'm planning to order tomorrow, so if anyone has tried out the product and can share, I would appreciate it.