Right now I am using a Canon Rebel XSi. My lenses include a 18-55mm, 55-250mm, 50m f/1.8, Tamron 28-75mm f/2.8, Canon 25mm Extension Tube and a 430EX Speed Light.
I decided the Rebel XSi would be my best improvement over my Fuji S5200 after doing some hands on testing with a few models. If I had the patience I probably would have went with a 5D, but that would have meant waiting another year with a point and shoot that was not satisfying my needs.