I'm not a fan of very large focal range "super zooms". That said I consider the 18-250 to be one of the better of the bunch and it will save you from switching lenses all the time. You sacrifice quality for convenience though. I would recommend a 70-200 f/4. It is one of the highest quality zooms around weighing in under $600. That said I own the $2000 70-200 f/2.8 IS version. Lots of money for far superior low light performance (very important to me). If you have enough light to shoot at f/4 without IS, the f/4 version is nothing short of spectacular though. The 50mm is a good choice. I had the f/1.8 and later trashed it for the f/1.4 which I prefer by a very wide margin. The f/1.8 takes good sharp pictures, but its so cheap I felt like it was just going to fall apart in my hands. It doesn't take moisture, dust, drops, or any harsh treatment you could name well. I feel much more secure carrying the f/1.4 without worrying about ruining it every time I use it. Aside from just being cheap, the glass is high quality and the pictures it delivers are what I consider the most bang for your buck available.
