Like has been said above, the motor driven Hasselblads are in my opinion the best bargain in medium format used bodies. They will do everything an 500C or 500CM will do and more. The only real drawback is a gain in size and weight. My first Hasselblad was a 500C with non-T 80mm and a 12 back. It was all made in 1968 and in great shape. It was owned by a professional photographer in Grand Rapids, MI that had passed away. The family was selling off all his equipment and a friend of mine bought it and since he knew I wanted one and sold it to me for what he paid for it. He didn't do weddings, so it wasn't really heavily used. He did a lot of work for Kodak and made some of their "How to" videos about different aspects of photography. It came with all its boxes and last CLA slip. I've had it since around the late 70's, and it works just as well today as it did when I first got it, I've never had it sent out for service, but I did overhaul the shutter on the 80mm myself. After the 500C came a SWC, then an EL, two ELM's and finally a 553ELX, which I really like a lot. If I find a good deal on a 555ELD I'll grab it. I have other medium format systems, but will always keep my Hasselblad system, so I guess you know how I feel about Hasselblad. Backs are fairly reasonable, but lenses can set you back some. The later CF and CFi lenses sometimes cost more than some bodies do. I always say that if you can't do it with excellent Zeiss glass and a good Hasselblad body, then you should certainly look into a new hobby or different profession.
If you say you mainly do "street" photography, then the 500C/CM would be your best bet if you can't swing a SWC. My 500C with 12 back, 80mm with the waist level find isn't much bigger than my Rollei 3.5F. Of course, it's not as silent as my Rollei or your Oly XA, but it's not real bad either.