Definitely agree with the Rabbit about the snorkel. You'll probably abandon it in time, anyway, and all the extra valves do at the top is add weight and more of a floppy factor.
The Bio fins - GREAT choice. Have Atomic Aquatics myself now, but the Bios arrive today!
The Brigade - GREAT choice. Zeagle makes a spectacular BC, and I've been thrilled with mine. (I'm upgrading to a BP/W, however, that has absolutely nothing to do with the quality or satisfaction with my Zeagle).
Atomic mask - GREAT choice. I loved it (had to give it to my wife, 'cause it was too low volume for me, and with a 'stache it leaked). However, my wife loves it.
Delta, Viper, Datamax, can't comment on. I've got Atomic B2, Atomic SS1, and Aeris Atmos 2, respectively.
Good luck...