Wizards and worth. A wizard (I have a universal 12th level) is whatever you have chosen plus clever use of spells. Efficiency is tough across many scenarios, but tactical options can be built up. Creativity in using any spell/spell group is best. Most of all, plan to have fun. There are benchmark spells of course. Color spray is darn useful, as is burning hands. When it comes down to contact, mage armor and shield are pretty useful, but not offensive. Find a balance. If your group is restricted, getting another wizard to buddy with you might not happen. The good thing about copying spells is that you can be selective about which ones you get. Nothing worse than two wizards with the same spells or prohibited schools of spells trying to copy out new spells. And remember, wizards might be the only party member to use a magic device in scenario. In short, spell lists are limited, but they are also open for creative use.