[Next_rim]

Option A:

drop 4x chargelots (400+200 on prism)->micro like a boss->kill 8+workers
-400 mins to replace workers
-200 min in mining time loss,
-200 min by forcing 1-2 spines out.

Option B:

Endanger a prism-load of sentries (400 gas ffs)->do 0 damage->lose a major battle with sentries out of position
-400 gas in dead sentries
-respect from opponent for bad choice of drop combo.

I see a winner.