Hi Zack
Here are some sites that should give you more than you can use:
Go to the Synthzone homepage and click on Yamaha. Scroll down the list and start with PSR2000 Users site. They have some files you can download tweeked for the 2000 but will work on the 1000. Then click on resources, this will take you to a great bunch of sites for more free downloads.
Another site that will take you around the world getting styles also listed in this Yamaha section of Synthzone is PSR-The Unofficial Homepage.
Here's one that should keep you busy for a while:
http://www.spectromagic.com/PSR-Styles-Vault-Archive/ I think any PSR model styles will work on yours. You will find as you go through that all the other brands are listed and they have been converted to work on PSR models. Clavinova by Yamaha is another you will definately want.
Enjoy!
Scott