for an mf sorc is it more important

to raise vit and have hight hit points or raise Dex and be able to block more? i do meph runs mostly but hardly ever in hell, even at lvl 82 its hard, i got the usual gear, shako, soj, lidless, occy, but i get taken down pretty easy still, i raised my vit alot i think i got like 800 hp, but i wonder if i should have raised dex instead and been able to block.

i got a new sorc, what should i do?