Hi friends, I'm planning going to NY for Christmas and I'm taking my new Canon Rebel XT with me. I'm totally new to photography and I'm reading lots of posts here. This is what I've got: Canon Rebel XT with a 18-55mm 1:2.5-5.6 that comes with the camera plus a 75-300mm f/4-5.6. What lens & exposure setup would you recommend for shutting in NY at daylight & nights?... What about taking some portraits to my wife ?? Any help is appreciated!