It's not going to happen, I like to play with all my toys, but if I was to do this it would be my Rolleiflex Automat. I just enjoy using that camera more than any other. Great lens, Waist level finder, medium format..., so I like TLR's in general. I'm using my Ricoh Diacord L a lot right now, mostly because it's new to me. There are things about TLR's that also drive me to use other cameras like size, not the most portable camera.
For 35mm it would be my Laica IIIf. Other cameras I use frequently include the View Master camera, Polaroid 250 Land camera and a Bolex D8L for 8mm movies.