So what if Wizards have a high Int and thus will have more skill points? They are meant to be studious and know many of the Knowledge skills.
In my house campaign I DO give Wizards 4 + Int mod. BUT half of their skill points must be spent on Knowledge skills. Eg an elven wizard with a 17 Int would get 7 skill points after 1st level and must spend 3 skill points on updating his Knowledge skills, the other 4 skill points would go to Spellcraft, Concentration, a Craft and a Profession skill. That way they can then know a number of Knowledge skills like I envisioned they would, being cooped up with books during their apprenticeship.