I saw these @ Buy.com but not sure what the extra "P" in the model number is for.. besides the $100 difference ?
and the 5Hz extra refresh rate...
21IN/19.8V 24MM 2048X1536 @80HZ CPDG520 FD TRIN
(Sony) - (CPDG520) $635.00
21IN/19.8V 24MM 2048X1536 85HZ G520P MULTISCAN FD TRINITRON
(Sony) - (CPDG520P) 738.00