Overall since I started playing: CE Leopard
Second half: Pro Starfire (SL mold)
Recently: S-PD Freak.
Until recently, I've almost always carried three Leopards: a beat DX, a beat SE, and either a CE or Star. My CE Leopard is still the favorite disc in my collection (with a lightning bolt dyed 10x KC Teebird a close second). I retired all my CE plastic a few years ago, and have never quite gotten as attached to the Star Leopard. I've played so little in the last number of years that I really have no feel for any of my discs, so I've been switching out most of my bag to avoid losing any more of my all-time favorites.
I'm a noodle arm, so I'm throwing my PD on holes where most of you are probably throwing mids and putters. Still throw the Starfire, I often use a Blizzard Wraith on longer, open holes, and currenty use a TD2 as my understable drive of choice. I'd still love to find a slight-to-mid understable fairway driver to replace the CE Leo and perhaps be my #1 choice off the tee. Already have a Trak and River in my bag, with the Trak being preferred at the moment. May try a Patriot next.