Hello all: I'm pretty much a beginner with photography. I received a D3000 for Christmas, and have been practicing and reading photography books since. I have the kit lens along with a 55-200mm lens, but really would like some recommendations for a wide-angle lens. I enjoy mostly taking urban architecture and landscape photos. I'm still unsure about a decision between zoom/fixed lenses, but am leaning towards fixed since they supposedly create a crisper end photo, and are supposedly better for learning. My budget would be somewhere between $500-$800 (or $1,000 if I'm in a spending mood). Suggestions?