BiS is very dynamic, it depends on the amount of accuracy you are shooting for. The guys in Rotation Reborn are working hard to find the true accuracy cap, so we can use ONLY that much accuracy, and spend the rest of our stats on dps.

Here is a list of BiS for various accuracy levels, thanks to KrystalF

BiS with T5 gear
http://pastie.org/private/qpfxgvdvj1hmlkxiwt5tq

Pre T5 with Extremes BiS
http://pastie.org/8614681#1

Pre T5 BiS
http://pastie.org/private/u93gaqcronr969rbbmh8q