That shield is pretty nice. The stats could be a touch higher, but that crit amount is pretty awesome (10% is max). I'd value you this in the 1.5-2m range at the very most, because it doesn't have have any resistances or any extra flavor (MF/GF/Armor/etc). This shield would essentially be for the DPS gain, and not survivability. Do a search for Int/Vit/Crit % and see what shows up, then just manually look at the similar shields block percentage.