I always start my wiz builds out with 14 base str, for a couple of reasons.
1. You're warforged and it's cheap.
2. Every mob and their brother cast some kind of str debuff, even early game, and it's annoying as heck to be constantly debuffed and more or less rooted in place if you're carrying any loot, and it's a while before you find a decent enough str item to make up for an 8 starting str.
3. At almost all stages of the game throwing on masters touch and beating on things with a 2h weapon is a viable, and in some cases better method of mana free damage. This is especially true the first 6 levels or so. By far the easiest way to level a new wizard is to get a good 2 hand and go beat on stuff. A 14 base str will give you enough to hit to remain viable. It also remains handy for beating on stuff in a firewall, depending on what mobs you're beating on. Some of the harder hitting stuff is a no no, but with warforged damage reduction, blur, haste, displacement, etc, there are a lot of trash mobs you can just stand in a firewall and beat on with a 2 hander. There are actually some interesting strategies you can pull of with intimidate, but that's a different build :P