Hello,
Don't worry if you don't find anything stating specific for SX700. I too have an SX700 and there is lots of good stuff from a variety of keyboards that work just fine. Anything SX and Genos is a good initial focus area but many of the older models files will surprise you on how well they work on your keyboard. Just download what you see and enjoy the fantastic stuff that people have put out there for your use. Yes you will find things that don't work and you will know right away so simply delete them and eventually you will end up with everything that works.
Playing around with them is a good starting point to become intimate with your keyboard and
it's functionality.
The first thing I did two years ago when I got my SX700 was to purchase the STYLE #14 from the ORDER section of this forum. Had lots of good stuff, well organized and the good thing was that it contributed to the support of this form. I also recently purchased STYLE #17 which added a little more flare to the previous Style pack. Then from there I downloaded good Styles from posts that interested me.
Good luck and enjoy everything you will need for now until you create your own Styles, Registrations, voices and pads to suit your requirements.
dom