Hi all, I currently have a D90 with a Nikkor 50mm f1.8, Nikkor 18-55VR, and Sigma 70-300 f4. I have some various gift cards for a local camera shop, as well as a few dollars saved up. I am probably in the market for a lens up to $500 and was toying around with a few ideas but I have no idea what to do. I like to shoot architecture, skylines, and portraits. I use the crap out of my 18-55 and I use the 70-300 a lot in the 200-300 range. I use the 50 for portraits and anything darker like concerts and such. 1. I was thinking about getting a 11-16 Tokina or the like to add to the bunch as a fourth lens. 2. Possibly upgrading the Sigma to something ED Nikkor. Will the FX 70-300 work on my body? I don't want the 200 because I use that 200-300 range a lot on top of mountains and such. If I sold the Sigma, I could easily get 150-200 out of it on craigslist and get a decent upgrade. 3. Open to any other ideas that you have. I am not closed to changing the whole lineup, as long as I stay within that $500 range (could include trade in and selling gear) as long as it bettered my kit. Please help me!