2xkodachi for raiding is probably the most effective rush I see? On the right map (e.g. CCR) they frequently max out their chevrons on mex, workers, and raiders.
2x pyro on other maps (usually with abusable cliffs) is less reliable but equally devastating.
Blast wings when you know someone has a nice high elevation for their wind.
Widow for when you know a com is coming forward.