https://wiki.project1999.com/Ancient_Snake_Fang
https://wiki.project1999.com/Scorpikis_Claw_Impaler
both have multiple counter procs and are dirt dirt cheap. Ratios are not great but the procs are high threat.
If you have a decent haste item a faster better ratio white damage weapon may be better on average as procs can be streaky, but with the hypertwink era of this velious box you might need proc weapons to hold threat