The biggest problem with style files is there are so many bad ones out there. I would suggest going to
www.psrtutorial.com and click on the styles tab. You'll find thousands upon thousands there, many of which can be categorized from fair to good. A significant number, however, rage from good to excellent, and a small percentage could be placed in the outstanding category.
Of course there's another option. You have an outstanding keyboard, one that has a wonderful program called Style Creator, onboard. If you happen to find a style file that is close to what you are looking for, you can run it through the program, change any instrument, remove or add instruments, and a huge number of other features, then save this information to the style.
In addition to the style files, you'll also find detailed instructions for using Style Creator at the same web site.
Good Luck,
Gary