I own a Leica R9 and a R4. The R9 is may main body and has all the things I want on a camera: amazing viewfinder, ergonomic, resistant, half stops at the speed dial, a reasonable spot meter and capable of using the best lenses (a 50 f1.4 and a 24 f2.8 is all I need). The R4 is good as a second body although not brilliant... well it's a camera that you can buy second-handed for less than 150 USD and will take leica lenses.
As an alternative we can always try a nikon FM1-3 with a carl-zeiss lens. Impressive as well.