My personal preference in stats is around 3 INT / 2 CON, though you could go with more CON for PvP (or full CON if you want full-tank mode). There is no point in taking SPR since your summon consumes % of your mana, which means having more mana is useless. It's better to invest in mana regen, useful while your summon is off.
WARNING: This is not a crybaby wizard build, so don't play as one. Although Sorcerer allows you to play it safe, Cryo 3 + Warlock means going aggresive. Real aggresive.