Where to save games on desktop?

We are developing a title which will run on "PCs", ie. Mac/Windows and possibly linux. A few files will be written per save game and should be written into a suitable directory. At first glance, Application.persistentdatapath seems to be suitable, but it writes into the cache directory on OSX. No idea if the windows directory is similar. The problem is that the cache directory is just that, a cache. It can and will be cleared (on operating system updates for example), so it is NOT persistent.

Another option is saving into the users "Documents"/"MyDocuments" folder, but that might not be suitable either.

Anyone have an opinion how to deal with this issue? What do others do? Thanks in advance!