thank you very much for all the suggestions, i really appreciate it & will help with to decide on which secondlens to get. the 24-105 f4 IS is adequate for me as a general purpose lens as i use a full frame body, so the focal length is just perfect for me. i know that f4 is really not that fast but for me, i don't mind using a flash if shooting indoors so i suppose f4 is fine with me. in regards with the 70-200, i really want to have a lens in this focal length & i've decided that it would be the f4 IS or the f2.8 IS mark II. i think the f4 IS is great lens as well as the f2.8 IS mk II but at the moment budget wise i need to save more for the f2.8 IS mk II if i'll be going for it.