Which spokes to get, Wheelsmith or DT Swiss Spokes?
I don't know if this helps, but Peter White is a well-regarded framebuilder and wheelbuilder who has strong opinions on the Wheelsmith vs DT Swiss issue:


http://www.peterwhitecycles.com/spokes.asp
http://www.peterwhitecycles.com/DTspokes.htm


The gist of his argument boils down to two (current) main differences:

1) DT Spokes have a 6.3mm elbow length vs Wheelsmith 6.1mm (assumed) which can accommodate larger flanges, but are undesirable.

2) DT Spokes have a sharper, 'triangular' transition into the head, which has led to more cases of the DT Spokes popping heads off than Wheelsmith, which have rounded transitions.

In addition, there WERE a large number of issues with DT Spokes relating to their specification change in 2001 from 6.1mm to 6.8mm, causing problems with slop in the hub and sharper elbow angles making the lacing more difficult. These have since been remedied and the elbows are now down to 6.3mm, but not back to the original spec and WS hasn't changed their specs around (perhaps this is circumstantial evidence, but it makes WS seem a more steady design than DT).