Actually it would take u to the next lvl of fcr, because u would have 70 % fcr, and there is a fcr bp at 63. The belt is used for 20 to dex and dmg taken goes to mana.
at lvl 91 i have aprox. 1450 life, 1400 mana, 45 % dmg red, she's faster than most dr sorcs.
And u can survive much more than 1 hit, with this type of sorc, of course if the other chars are legit.