Inspired by many of the images posted by my fellow Serious Compacts members, I've been threatening to turn my attention to wildlife photography. Now, I don't think anything like a Sigma 150-500mm lens on one of my Pentax DSLRs is going to be a practical solution for me - in terms of both price or ergonomics. But I do have my Olympus E-M5 and the Panasonic 100-300mm zoom (600mm equivalent at the long end). So here's my question: Based on your experiences, is it better to go with this set up for things like birding (and other skiddish animals) and cropping my images... or opting for one of the better superzoom bridge cameras, be it an Olympus SP-100 (1200mm equivalent at the long end) or something like a Fuji HS50, and not cropping? Did I mention that I can get a refurbed SP-100 for under $300 during Oly's current sale along with an extra discount coupon that I have?