I have been a hobbyist photographer since 2009 when I got my trusty D5000. I'm by no means a pro, but have been volunteering my work for charity organizations for the past 4 years. I own a D5000, a nikkor 50 mm 1.8 (my main workhorse), the kit lenses my camera came with (18-55, 55-200) and a flash (sb700) plus a few trinkets. Many of my events have switched recently to indoor only and there's only so much you can do with the 50 mm due to more restricted spaces. I have tried focusing on my kit lenses on some ocassions, but the results are not the same. I have been saving up to solve this and I'm thinking of buying two lenses for myself this Christmas, the sigma 24-70 2.8 for indoor events where I need a zoom and Nikon 18-200 to have a walk around lens outdoors. Someone advised me to replace my body already, but I feel my old camera still has a lot to give and is only halfway through its guaranteed shots. So I want to build a collection of glass useful to me before even thinking about switching. My questions would be: 1. Do you think the sigma is good enough for my needs or should I be looking into other lenses? 2. How similar is the quality between the 18-200 and the individual lenses I already own (18-55 and 55-200)?; I'm thinking of either keeping them or selling them depending on the IQ between them. Thanks in advance!!