Hello all, I am wanting a new telephoto lens for my XTi. I am looking to take more nature shots outdoors - birds, bird feeder, berries, flowers, bees, etc, and if indoors, it will probably be on a tripod if needed. I don't print much as of yet, mostly web stuff, and I like to crop down my shots to get closer. Right now, I have: Canon Nifty Fifty f/1.8 Canon 100mm f/2.8 macro Tamron 17-50mm f/2.8 So after weighing my options, I am leaning toward the Canon EF 200mm f/2.8 II USM - About $660 at B&H. it is fast, fairly light weight, and the reviews are great. Plus I can add a tele-converter later for closer shots. The negatives are that it isn't IS, but the lens is so fast, I hopefully can keep it on a higher shutter speed. And my other option is to save a ton of cash and get the new Canon 55-250mm f/4-5.6 IS - Cheap at $300. It has okay reviews, and does have IS, which should help with the slowness of the lens, but I am afraid I will be disappointed with the quality of the shots. But with the money I save, I could also consider a nice wide angle lens (sigma 10-20mm). And then last but not least, the Canon 70-300mm f/4-5.6 IS USM - $550. It has IS, is cheaper than the 200mm prime, but it's approximately the same size as the prime. This lens also has good reviews. This lens was the front runner for months, but then I really looked closer at the 200mm prime. I am really not considering the Canon 70-200mm f/4 USM - I don't see any features that top the 200mm prime. It is larger and doesn't have IS anyway. Okay, so now that I have written my long over-detailed post, does anyone have any advise? Thanks!!