Standard set??

1st choice: BLUR (the whole list). Like Hoof above stated, it is one of the few set you can't do without. It is critical to my day-to-day work.

2nd choice: NOISE (the whole list). This set too is one that becomes very useful in making photo manipulation and enhancements beliveable.

Third Party Filters?

It would have to be: Digital Elements - **Aurora
it's one of the few that i've found an actual use for...

:)
retrocity**