Best chocolate brand for holiday chocolate bark?

Hello,

I'm interested in making cranberry/nut/chocolate bark as part of my holiday gift to my office-mates. I want it to be sorta special, so I'm looking for a great quality chocolate (both white and dark) to for my recipe. Does anyone have any suggestions on specific brands that would be good? I'm willing to pay a little extra over standard supermarket brands, but also don't want to break the bank as this will be for several dozen people.... Any help would be appreciated!