Like slappah said don't worry about stuff until level 60
You have no accuracy requirement until 8man raid

About the Blm stat... It's really hard because it's the DPS (with now the summoner) which need everything !
So you can have a lot of ss, crit or deter everything will be good !

And SS have not been nerf... Only boost

I like a crit ss Blm personnaly (quick and can be deadly)
Crit deter (slow but big number)
Deter ss (quick and steady, no big number but more constant)

Only depend of your play style