I am just getting into photography and was wondering which lenses I should invest my money in. i take pictures of everything but mostly outdoor scenes and some indoor stuff. i have a 18-105mm VR which is the kit lens that came with my D90 (which is nice) but i was also looking into the 70-300mm VR and/or the 50mm 1.4G. Im going to europe spring break and i want to make sure im covered. also could you suggest some filters i should get for UV and polarizing. Thanks.