Decisions, Decisions! Which one to use the Tamron @ 2.8 or the 15-85 with extra reach. I am seriously considering the tammy @ 2.8 coupled with a 85 1.8, then sell my wife and kid. I have to keep the dog and buy the 70-200L f/4 IS later down the road when it is more affordable. I have been studying both copies and they seem very similar, but very different @ the same time. Oh, back to my research. Thanks for your advice!