I don't think I would spend any more money on 645, save for a 40-50mm for some wider scenes. I'm comfortable with my setup currently, but the 50D just isn't the everyday shooter I wanted. Highlight DR is insanely terrible, and the high-ISO banding in tungsten light is sometimes irritating. I'm not printing much out of the 50D lately, and maybe I either need to slow it down and just wait out a slow period of frustration, or digital to paper isn't for me. I don't know, it's not really a matter of indecisiveness per se, but I am glad I didn't double down and buy out that 1DIV.