Erudites are perhaps the most obvious choice as they have the highest intelligence. The disadvantage of erudites is the lack of infravision which can make life difficult at early levels. Dark elves are another fine choice for wizards as their intelligence is not much lower than erudites and their other attributes are a bit better. The problem with being a dark elf is the fact that being an evil race will make you less acceptable to the outside world. Gnomes are another race that should not be overlooked.
Gnomes can tinker and create nice trinkets such as infravision goggles.
Gnomes have very high intelligence and also have infravision without the disadvantage of being an evil race. They are a hard race to choose against. High elves can also fill in as wizards pretty easily however they are probably not quite as suited as the above three. The most important thing to remember if you decide to create a wizard is that things will be very rough early on. Do not base your opinions of this class by it's capabilities at early levels.