edit: i think ive narrowed it down. tamron 17-50 f/2.8 sigma 17-50 f/2.8 MAAAYYYYBBBEEE the sigma 17-70 f/2.8-5.6 (i think ive ruled this one out because i want a faster lens throughout the range.) and im not so much interested in the 28-70 because i like wide shots SOOOO the new question is, sigma v. tamron... the sigma seems do be a bit less money. i still only have the canon kit lens. i like the versitality of it, but its... you know... the kit lens i dont want to spend much more than 200, and im not interested in a 50mm at the moment, ill pick one of those up later on. ill probably just search though the used stuff on some of the photo sites and pick on up when one looks interesting. ill probably be getting a sigma or a tamron. so between those 2 is there something i should look out for, or stay away from.