I think there are too many and you don't really need them all. If you buy each spell from each Mage in the College of Winterhold, you will end up with more than 60 spells and I think that's a lot. I only rely on a few and if you add up the about 30 shouts availables, you have plenty enough and more than you really need in my opinion.
I only use : Thunderbolt ( very powerful shock spell ), Ice Spear ( the best frost spell ) and Fireball. Sometimes I use Paralyze and Soul Trap. When I feel like it, I use Lighting Storm or any of the wall spells. The only conjurer spell I use and not always, is Dread Zombie. The rest of them are there in my stock but I don't use them.
About shouts : I use Unrelenting Force, Candlelight, Clear Skies, Slow Time ( the best in my opinion especially very useful against a group of vampires ), Dragon Aspect ( excellent but only available once a day ) and Drain Vitality. Other than that, I don't use any.
In my opinion, I think we have more than enough.