I started out my photography hobby with a digital SLR and personally didn't like it. I arrived at a similar dilemma. For me, the camera body has to be completely transparent. Its just me, the lens and the subject. Every digital SLRs, I tried got in the way with all their complexities. I found that the more I learnt, the more complex things got. Sure, as time went by I got faster and more experience with the camera but it was still found it a bottleneck between me and getting the shot that I wanted. My dSLR was stolen on a trip and to tell you the truth, that was probably the best thing that ever happened to me as I then turned to all-mechanical cameras and feel that I grew much more as a amateur photographer as a result.
I recommend a Pentax MX like the one I have.
They are very compact. It is smaller than my Leica MP rangefinder overall but slightly thicker due to the mirrorbox. The MX is an all-manual, all-mechanical camera - it only requires batteries for the meter. If the batteries die, the camera will keep on working - you just have to use your brain for metering. This is not as hard as you might think. I only use mechanical cameras. I've been using my Bessa-T without batteries for the last month and I don't have any worries using color negative film. I guess the exposure and if expect the shot to be good one then I also bracket - half-stop higher and half-stop lower. If I was shooting colour slide film, that would be a different story. I think that I would want a meter then. The compact size of the MX and all-mechanical nature would make it an ideal back-up camera for your digital.
I love using my Pentax-MX. It's completely transparent except for the loud shutter. Set aperture, set shutter-speed, focus - that's it. The VF is nice and bright and covers 97% of the frame. The unfortunate thing is that prices are going up. Mine cost me $100 and its in mint condition save for rub marks on the chrome from the neck strap and it had a recent CLA. I'm now seeing MX's in worse condition than mine going for $150+ at times.
I wish that Pentax made a basic, all manual SLR similar to the MX but with digital sensor. No buttons, no LCD screen - just an ISO/shutter speed dial, aperture and focus rings on the lenses - that's it. I'd be in heaven with a camera like that.