coolness is always a very high factor I consider for duals. First is to get a list of the ones with the crit SA then choose the rarest/coolest ones of of the pair. I am used the shasmir*raid on my bd (they are now on my dwarf look cool on them) and now I am using nightmare*nightmare for b grade.
Im not worried to much about looks for c grade, and yea i think i will use dual nightmares for b grade, thanks for the help. im prolly gona try both anyway and see which i like more, leaning towards the +crit tho
The only viable choice is Focus duals, so Spirit*Raid, Spirit*OrcSword (whatever its called, the ugly orange one). Although I used dual Kats, because they look great. :p