I'm using a D3200 for UV and a D5300 for IR. Studio work in UV: D600. product shots in studio: D2H. UV video: Panasonic GH-2. Everything else: nearly always the Df. Or a D800 if high resolution is mandatory. The 1 Nikons for pleasure, underwater, or just playing around. If the mood really hits me, the Fuji S3 for various UV, multiband, or IR.
Sometimes I open another cupboard and extract various older Nikons such as D40x, D200, or even the D2X.
The limiting factor for travelling is reducing the number of different battery types and associated chargers. Good grief. What a headache. I have a big box with all those chargers in. Easy to put in a car, impossible to haul onto an airplane.