White pepper adds sort of a musky, fermented spiciness. And fresh ground is more so. Cracked mustard seed is good too, but might be too mild for your liking.
Our KMart had a ton of the Heinz injector bottles, plus another kind with a brush top. The needles are pretty big, no need to worry about getting poked, plus they clean up nicely in the dishwasher. I rather doubt they're made by Heinz.
Garden Ridge had similar no-name ones in their outdoor stuff, too.