First of all the surge is nothing like the beast. You'll get a lot more glide, stability, and consistency with the Surge over a Beast. But I would agree that a beat in Z-Flash is comparable to the Beast.
As for the eagle that's honestly kind of a toughy. My best guess on that one would be a beat in Tsunami by DGA which is basically Discraft's Predator in a different plastic. It gets great glide for a stable disc and finishes fairly hard left at the end of it's flight for a right handed player. I don't know the eagle too well, but it seems like a semi stable disc with decent glide, and that's what I believe a beat-in Tsunami flies like. The Tsunami might actually be a tad faster though.
As for the Tracker, it flies like a New Teebird and when you beat in the tracker it flies like a very nice and straight Teebird that is more than likely beat in too.
i love the Champion Orc and have 6 all in verying stages of use. i can make them do all the same things, even the very first Champion Orc I ever had and that was a second hand off ebay.
What i find is that Discraft drivers tend to skip further... for comparsion I think the Discraft Elite Z Wildcat (my fiancee's disc) flies VERY close to a Innova Chapmion Orc with a little further skip when first touches down. what do you guys think???