I know you're itching for Visual SVN-alike on the mac, but one of the big reasons you're not getting a lot of answers is that SVN and Apache don't exist by default on Windows (an itch that Visual SVN scratches), but do exist on OSX.
The argument goes like this: if you're savvy enough to be using SVN, then most likely you will either be happy with what OSX has by default (command line!), or you likely have a Linux server somewhere that serves SVN for you.
I recommend a couple of options for you in addition to what everyone else mentions:
- Keep your existing windows machine as a server for your SVN needs
- Run a VMWare appliance + VMWare fusion (here are some Trac+SVN appliances)
