I purchased a Canon 70-200mm 4.0L yesterday from B&H. I got it overnight so it should be here tomorrow or the next day... Now, is that a good choice for the money? It will be my first L lens, as you can see in my sig. I will be taking it to my cousin's wedding this weekend, think it will do well? I have hardly any experience shooting with that slow of a lens...will I have problems? Was this a good purchase as a beginning of my career lens? Or would there be other ones I should have got first?