Dunkel-Boy
I have been looking for centennial aswell, but like ya said, it seems to be impossible, though I know ya can get em in bulk from hop wholesalers, so it seems odd that no brewshops carry em. I just dunno what the hell I would do with 5kg of a single hop! A few brews I wanna do call for the dry hopping of centennial, or centennial AND cascade, which leads me to believe there may be a slightly different flavour profile between the 2. Sierra nevada celebration is one of em, and it is a damn fine beer, so I would like to recreate it as faithfully as possible. Let us know how Pacific Gem is, I may just try and get me hands on that instead, failing that, I will just use amarillo.
All the best, and good luck with ya 5 different hopped IPA's, I would like to find out which ones you find better.
Trent