Hello, I have been messing w/ a friends Canon 30D for a while and am gonna by my first SLR. I have decided on the Canon XSI that comes out this month and am pretty stuck on it but other suggestions are welcome. The glass for it i am having an issue w/. I originally was looking at getting the Canon EF 75-300mm f/4-5.6 III but upon reading more and more on it, i keep seeing CHEAP in the build quality and picture quality so have started looking at the Canon EF 70-300mm f/4-5.6 IS USM and Canon EF 70-200mm f/4L USM. When i look at the 4L, i see ppl saying that it is exactly like the IS USM but costs more, and the IS USM ppl say to get the 4L due to the pic quality. I mainly take pictures of nature (birds, deer, trees, what have u), and dogs at field trials and durring deer season. All of these lenses are in my budget range so if there is another i can look at for the same price pls let me know. Thanx for any advice on which glass and any other suggestions. Also looking at a Canon EF 50mm f/1.8 II for a close lense.