I got some crazy ideas for Invertigo's successor at CGA, as well as the IMAX.
-Extended Zamperla MotoCoaster - According to RCDB, the MotoCoaster at Darien Lake is quite compact compared to Invertigo, so it could be extended a tad or a small museum themed to motorcycles could be added.
-Intamin/Mack Megalite: I know it's a bit out there, but I bet it could start by the Invertigarden and use the IMAX site for the main ride. Besides, CGA could use some blue track
-Custom EuroFighter: I had originally thought about the Rage layout, but that would require some shuffling of stuff (except maybe where the IMAX is?). A custom layout could work a la the Megalite concept above.
-???