I have a lot; I ought to by now, having bought and sold so many.
Leica M3 - Leica's best viewfinder for the mighty Summicron 50mm Dual Range, and a thousand other reasons.
Bronica S2A - For the rendering of the old Bronica Nikkor lenses, and because it's like holding a football made out of a Cadillac.
Yashica MAT - The first, best-made, non-metered version - When I want portable medium format and/or the simplicity of one lens, one orientation, just shoot.
Canon T70 - Extreme practicality: AA battery, minimal but well-thought-out feature set, cheap & easy to replace (take it to the crap side of town, or hand it to a child), supports my killer collection of Canon FD lenses.
Fuji X-E2 - My digital sweet-spot.
Koni-Omega Rapid - Huge, preposterous, and surprisingly ergonomic, an image-quality monster.
Minolta X-570 - Perfect 35mm SLR feature set, and the glory of the Rokkor MC 50mm f1.4 keeps me from lusting after a Summilux.
Honorable mentions:
Leica iiic - Once I feel like shelling out $$$ to get it and its lenses serviced.
Konica FP - The old, mechanical F-mount, not the FP-1 - My personal high-water-mark of the visual aspects of SLR design: the curves, the font of the engraving, the off-center lens mount...