The best order of stats for a Wizard are as follows:
1. Intelligence - 20
2. Constitution - 18+
3. Strength - 16+
4. Dexterity - 10+
5. Wisdom - not used.
Notes on Importance of Stats:
The only one of those 5 choices that is DIRELY important is Intelligence. As a Alche, you need to have a very high Intelligence, or many of your spells will not turn out well. I would suggest AT LEAST obtaining an Intelligence of 20.