I use two varieties that I can get very little info on.
1. Comet, very similar to cascade but offered less aroma for the same additions
2. Serebrianka...we will have to wait and see.
I have also used amarillo, and chinook, and magnum for DH. All offer pretty interesting flavors...Amarillo is kinda cirusy, chinook is kinda crisp and effervescent, and magnum tends to lend a sweet hop flavor with more of a punch kinda taste. At least those are my impressions.
Anybody else care to chime in?