A DX Eagle is easier to flip IMO than an Opto Striker. I agree w/ Jax's assessment of Strikers being a bit faster than Teebirds. A Striker won't fight back to fade as hard as an Eagle would, even a new DX Eagle won't turn and burn as severely.
I suggest trying some hyzer flips with the Eagle before you get a Striker, hyzer flipping discs have more than extended the bag life of my flippy discs and beat Eagles can do some crazy hyzer flips. The Striker is a cool disc though, combined with a River it's probably a pretty sound driver tandem.
Thanks guys! I think my bag is finally set now. Thanks again for all the help!