My birthday is coming up, so i was going to buy a lens on b and h. My birthday is about a week away. I wanted to get the 45-200 mm Panasonic lens (Panasonic 45-200mm f/4-5.6 G Vario MEGA O.I.S. Lens H-FS045200) The 20 mm 1.7 (Panasonic Lumix 20mm f/1.7 Aspheric G- Series Lens H-H020 B&H) orPanasonic Leica DG Summilux 25mm 1.4 (Panasonic Leica DG Summilux 25mm f/1.4 ASPH Micro 4/3 Lens) and finally, The olympus 45mm 1.8 (Olympus M. Zuiko Digital ED 45mm f/1.8 Lens V311030SU000 B&H) Out of these lenses, which one do you think is the best value. I cannot decide between a fast prime lens or a slower telephoto lens. I have tons of birds in my area that i really want to photograph. I really want better performance in low light to. My budget is kind of tight and I am going on my trip soon so i have to pick only one.