Thank you, C'rysta and ispano! Highly appreciated!
From what I understood: Adding to/maxing an existing stat might be better than adding a new one.
Might also ask the other BLM (who's much much further into Coil) what he's aiming for. When I tried t5 as BLM (only went as WHM before and still not finished btw) I found out that I really lack Accuracy, so this might be an important stat for me.