The 1948 Zeiss Ikonta 521 folder with tmax 400 has become my walking around camera. I got it last year as the cheapest entry I could find into MF. It feels wonderful in the hands, much like my old (but much newer) Pentax ME Super. The precision of the unfolding and the whole concept of a pocket MF camera bring so much pleasure to shooting. The sunny 16 exposure and zone focusing have taught me much in the last year. Oh, and yes it does get looks and questions.
Not for walking around, but amazing in the quality of the image it captures, is the Mamiya C33 tlr that I've had for only 3 weeks. Still getting to know each other, we can be painfully slow to set up a shot. I love the solidity, the weight, and the flexibility of interchangeable lenses. When using it, I know the quality of my work will never be limited by my equipment.
Both of these cameras have an excellence of engineering and elegant mechanical simplicity that you can't find in digiplastic. Heck, the C33 manual took 20 minutes to read. It's almost embarrassing, the amount of respectability that the reflected glory of these cameras gives to a beginner hack like me.