Currently I have 14mm 2.5 and 45mm 1.8. Im planning to buy new lenses mainly for video purposes. I will keep both the 14 and 45 for portability and portrait. So my question is, which of these option is the best bang of the buck? I currently have gh1 and I want the best/decent lens/lenses for traveling and also for shooting in low light. Keep in mind that Im probably gonna buy BMC pocket camera down the road which has around 2.6-2.8 crop factor. Thus, 12mm is equivalent to approximation 31.2-33.6mm FF equivalence. 12mm end could be my all around focal length. IS also play an important role here for run and gun situation. The price for used SLR Magic 12mm is around usd400-450 14-140mm used is around usd430-450 and 12-35mm used is around usd900-950 So the prices are nearly the same. You guys are also welcome to suggest me other options.