First, I know this thread was started in reference to a wizard but, KDL, how can you not list Divine Power - the spell that is the heart of the "clerics are better fighters than fighters" discussion - as the best 4th level cleric spell?
Now, for some of my opinions:
0th - Prestidigitation - it just so many cool things! Are you dirty? Cast prestidigitation. Need to light a torch? Cast prestidigitation.
1st - Endure Elements - this puppy lasts 24 hours. Very useful for a sorcerer who has slots left over at the end of a day (particularly high level slots that can be combined with Extend Spell). Running around with 5 resistance to every element is nice
( I would say magic missile but don't you just know that everyone has shield up or a brooch of shielding?)
2nd - eh. lots of so-so choices. To me, Knock is the one "must have". There are seldom any other good options when you meet an Arcane Locked door. Most every other 2nd level spell has good substitutes.
3rd - I think Greater Magic Weapon outshines Haste. Haste is nice for blowing through your spells but GMW can get through DR and I think serves fighters better in the long run.
UofMDude