Barleywine
+1 for Norse, and Druidcraft. I think they might be seeing a resurgence, thanks to Vikings & Game of Thrones.
I like Kat Black's Touchstone Tarot - it's got a generally very sober feel, and with the brown wallpaper backs and classical paintings, it wouldn't seem out of place in a a gentleman's wood-and-leather smoking room.
For something different, I might suggest the Universe cards - oracle rather than Tarot, but beautiful and sciencey, that might appeal to some. I love them.
Looks like Norse Tarot is another one I missed out on new. The Touchstone has been of interest to me off-and-on, but price and availability are once again an issue.
The word "science-y" strikes a chord with me; maybe I should reconsider one of the Steampunk decks?