Contax and Zeiss SLR gear are not a "light weight" decision. Then again, either are most SLRs. I may not be 75 years of age, but I feel that way after a 10 hour wedding carting around just about any pro level SLR system.
Perhaps an Aria and a few select zooms would work for what you like to shoot. Were it me and I were shooting the list you outlined, I'd just take a Leica M and 3 lenses max, or a 90 and TriElmar ... since this is a Contax forum substitute a G camera and a few lenses. Just a thought. Weight verses quality of image would not be in question that way... since both are well established features of these rangefinder systems.
Perhaps an Aria and a few select zooms would work for what you like to shoot. Were it me and I were shooting the list you outlined, I'd just take a Leica M and 3 lenses max, or a 90 and TriElmar ... since this is a Contax forum substitute a G camera and a few lenses. Just a thought. Weight verses quality of image would not be in question that way... since both are well established features of these rangefinder systems.