I do mostly automotive photography right now but I am hoping to get better at portraits. I also want to hit up the local zoo and take some pictures of cute animals. I currently shoot a D300 + 17-55mm. I also have a 3 SB800 setup with a SU800 and I wish I could step back a little more because with 55mm, sometimes I cant even trigger my lights. I know these two lenses are in different leagues, different price range, and one is faster compared to the other. I have some questions before I pull the trigger on one of these lenses. 1. How are the IQ between these 2 glasses? Fairly close? 70-200 owns all? 2. I have enough to buy the 70-200 but if I get the 70-300, I can use the rest of my moolah on something else. So do you think it's worth it to spend the extra $1200? 3. How accurate are the colors in both lenses? I remember switching from 18-70mm to my 17-55 and the white balance dramatically improved (I set my WB to auto). With my 18-70 when I used "Auto color" in PS, its totally a different color while in the 17-55, auto color will slightly change color. Sorry if this is a repost, if it is, please direct me to the other thread. I would really love feedback from photog that has experience with both lenses but any input is greatly appreciated!