You should download the PSR740 styles from
http://groups.yahoo.com/group/yamaha-psr-styles/files/ or from
http://spectromagic.com/PSR-Styles-Vault-Archive/. Then you can set up One Touch Settings for each of your favorite styles (Something you couldn't do with USER styles on the PSR740).
You should also download the CVP209 + OTS styles from the first website mentioned. Put all of these styles on floppies. Now you will have over 600 great styles to work with.
Good luck.
Larry