Hi all. I have been struggling to make a decision so I thought I would put it out there and see what you have to say. I am a student and I am studying abroad in Spain in the fall. I have been photographing for a while now and know my way around a camera. I went from the Nikon d50 to the d200 and currently Im using a d7100. I've noticed that my current lens, 18-70 f/3.5-4.5G is just not that sharp on my d7100. Before I head to Spain I want to replace it. I should also mention that I will be doing a lot of photographing in indoor markets so I also need the speed boost. I'm currently looking at two different lenses (although I am open to suggestions). Nikon 17-55mm f/2.8G (used) Sigma 18-35 f/1.8 (less used) Long term goal would be to pick up a 24-70mm f/2.8G But I really can't afford it right now and I really need the wide angle. I eventually want to make the switch to FX so I'm a little hesitant investing in a DX only lens (like the ones listed above) but I also need something that will work for me right now and is in my budget. I appreciate any feedback you can give me and thanks for the help!