Hi, I am new to this forum and would like to ask a question regarding my Nikon kit. I was given a new D90 as a Xmas present. The kit included 18-55mm VR and 70-300mm VR. My question to the gurus here is how much of a gap would be this 55-70mm ? I mostly take portraits and pictures inside home with some occasional travel. Would this be a big gap so as to get a 18-105mm or a 18-200mm ? Please let me know if anyone has any suggestions or advice. Thanks.