How important is being inconspicuous to you while street shooting? dSLRs are big and conspicuous, and with faster zooms on them, they can be intimidating to subjects. Discreet shooting while possible, is harder with one.
You may want to take a look at mirrorless compacts--both fixed-lens and interchangeable lens. Fixed-lens large-sensored compacts tend to have a 35/2 equivalent lens. The
Sony RX1 is a full-frame camera in the body of a compact P&S. The
Fujifilm X100S is currently the darling of the shoot-streeting set, not only for the retro styling and handling, but also for the small light size and image quality. If your preferred lens is the film equivalent of a 35/2--these cameras are right down your alley. Tracking/low-light autofocus speed seems to be the only place where these cameras might be lacking vs. dSLRs; but on-sensor phase-detection AF is starting to sneak into the lineups and that seems to have improved performance in this area (see X100S vs. X100 comparisons). You could also consider
the Nikon Coolpix A which has an APS-C sensor in a compact body.
For interchangeable lens system cameras, you could wait and see what Sony has up its sleeve in an IL-version of the RX1, and its APS-C NEX system. Fuji has the XPro-1, XE-1, and XM-1 with a growing number of lenses. And if you really want to go small, and are willing to compromise on sensor size, there's Panasonic/Olympus micro four-thirds. The upcoming Panasonic DMC-GX7 and the current Olympus OM-D cameras seem to hit a sweet spot in terms of features, price, and image quality.
There are a lot of non-SLR choices out there today, offering similar image quality and a quite different feature set that seems to favor street shooters: small light, compact, great fast wide-to-normal primes, tilted LCDs for waist-level shooting, etc. I'd recommend doing a bit of research to see if one of those systems might be a better fit.