I'm looking for some sort of adapted "normal" lens, either a 24mm, 28mm, or 35mm prime. I've owned many lenses in this category, including the Zuiko OM 24/2, Nikon 24/2.8 AIS, nearly all the Canon EF lenses, several Zeiss ZF/ZM lenses, CV 35/1.4, etc, and I'm having trouble deciding which one to buy for the NEX. My ideal focal length would be 28mm (actual, not equivalent), and I'd like f/2 or faster. In general, I'm having a hard time choosing between an SLR lens (closer minimum focus, better edge sharpness for NEX) or a rangefinder lens (smaller, lighter). My budget is ~$500 max, cheaper being better. Recommendations?