Leica M7 with the newest aspherical lenses. But, that would be "prohibitively costly"? Another way to go would be the M6 (M7) with the previous series of lenses. The benefit there is cost and size/weight. I believe they are a little smaller and lighter. Another series of lenses are the Zeiss Biogons. On that point you would need to compare each lens as per quality, weight, size, & cost. That would be a lot of homework but worth it.