I think I'm going with the build below for the following reasons:
the buffed chain shock appears to be awesome.
thrashing blades gives us a straight up 6% damage increase to our VS and Lacerate to use between our shocks and discharges.
the 9% ArP buff of charge mastery would be nice, but that doesnt buff our discharges at all. without a combat log its hard to tell, but it seems like our VS's would benefit more from the 6% damage increase than from an additional 9% ArP. with a rotation of VSx2, shock, discharge...rinse repeat, the build below seems to maximize it out.
http://www.torhead.com/skill-calc#200MZhGMRkhMrtzZf0c.1