Hi, I am relatively new to DSLR photography (6 months or so). I own a D40 with 18-55mm kit lens and am starting to fell hindered.(settings are a pain to change and lens isn't everything I need) I am currently taking Photography A level and am in the middle of a night project. I will be traveling to New York City in about 4 weeks and need something nippy to take with me. It needs to be fast and good at taking handheld night shots as both the empire state and rockerfeller centre won't allow tri-pods. I know I am restricted by the lack of Af motor in the D40 so would a camera upgrade to say the D90 be more plausible than getting a lens? any advice/suggestions/tips will be greatly appreciated.