Hey everyone! Just had a question on the Canon 70-200mm f/2.8 IS lens. I'm gradually getting into Freelance Photography and I'm looking forward to buying a 70-200mm f/2.8 IS. The thing I'm stuck between is whether to buy the first version of the lens or the newest version (II version). I can find the I version for about $1450 while I know someone selling the II version for $2000. Both lenses are "like new." As far as budget goes, I'm not really on a budget as I can afford both lenses in a month's time but I'm not sure if it's worth spending the extra $550 for the II version. Any thoughts on the situation? I currently have the 70-200mm f/4 NON IS version and I love the lens but I want something with a wider aperture so I can actually use for indoor parties, etc. Thanks for all the help in advance.