Steve - I thought I had answered that .....small (unobtrusive), fast (ie no shutter lag), ability to zone focus, preferably with a viewfinder (personal preference - I've never really enjoyed the Ricoh's lack of one), 35 to 50mm equivalent fixed lens. .....
In addition to my professional DSLR's I have several small consumer DSLR's, a host of PNS cameras, a Sony NEX-5, and a Fuji x100. I don't think any of these is perfect for street photography, but I use them all for street photography all throughout South East Asia. Each one excels for a different style.
If I had to choose just one, and lately when not working I have been choosing just one, it's the Fuji x100. A great viewfinder, excellent IQ, small, jacket pocketable, unobtrusive, fast frame rate, excellent fast lens, love the controls (aperture on the lens, shutter dial, ev dial), but for street photography focusing is the biggest drawback. It has several focusing modes.. but it's not a fast focus camera. Still, at 35mm and say F5.6.. it's easy enough to be right in there from the start.
The NEX-5 focuses a bit faster, but it's lens and IQ isn't as good, with the pancake it's about the same size, and the articulating LCD allows 'from the hip' and other perspectives you're not likely to use much with an actual viewfinder.
I'll often take a seat outdoors in a busy area and make captures with one of my DSLR's and 135/2.. but I've also used my 300/2.8 for further reach. A camera isn't obtrusive if you're so far away they don't consider you're taking their picture. or they don't notice it.
This might sound funny.. but my old Olympus OM-1n with it's 35/2 and tri-x is really hard to beat for the street.. It's manual focus is superb, controls great, the camera is small.. but I know no one wants to hear that..
If you'd said more about your style then maybe I could have said one suits your needs better than the other. Yet, I wonder if the new Nikon V1, IF it's autofocus lives up to the hype, might just be the best overall choice for street..