My "Go To" camera, meaning the camera I am most confident in using and producing consistent results, would be the Canon 350D most commonly mated with the Sigma 17-70 zoom. I know I'll have the overhead in the highlights shooting RAW and I know that 99% of the problems are photographer related. It's the family camera, the travel camera, the snapshot camera.
But I can't always carry it (I don't carry it to and from work, for example) but I really don't have a single "go to" camera in those situations. I've used my digital Canon A650, an Olympus Stylus Epic, a Canonet Q17 GIII, a Holga...it all just depends what mood I'm in I guess.