I loved DS9, I felt it was very unappreciated. IMO The Founders were a far superior foe than the Borg was. They created their own beings for support, they could shapeshift and overtake the highest levels of office and they manage to bring the three major powers of the Alpha and Beta quadrant together.
Hence Ketracel White.
Keep the Jem'Hadar in line. (and the Overseeing Vorta, who individually have next to no worth because they can be replaced like a spare tire)
http://www.youtube.com/watch?feature=endscreen&v=lH_ZcXRUFTc&NR=1