Can anyone help me out on which lens to get? I have a Canon XSI camera. Ive been looking into wide angles lenses which I want so bad. I Love that slight distorted look it gives. With out being that whole bubbly fish eye look that i dont care for really. And ive been looking into either a Sigma 10-20mm OR Tamron AF 17-35mm f/2.8-4.0 Di LD SP Aspherical (IF) Ultra Wide Angle Zoom Lens. DOES ANYONE KNOW WHICH WOULD BE MORE USEFUL & also gives the slight distorted look that I love. ??? Please if u can help me out. Thanks so much.