On you D3000, a 35mm lens has the same Field of View (FOV) as a 50mm lens has on a film of FX body. Back in the 1970's and 1980's most cameras came with a 50mm lens as zooms were uncommon and expensive at the time. The 35mm lens is considered a normal lens on a DX body. To see for yourself, set the zoom ring on your kit lens to 35mm and keep it there for a while and shoot. Then set it to 50mm and keep it there for a while and shoot. Which focal length works better for you? The 50mm f/1.4 is 2/3rds of a stop faster than the 35mm f/1.8.