Off-topic: Kingda Ka's theoretical max throughput is 1080 riders per hour, which is good overall but not for a ride of its investment and of its current operational practices. For comparison, Thunderbird at Holiday World cost $3 million less in construction (with 10 years of inflation between the two), has a higher theoretical capacity of 1140, and is cheaper to maintain and operate.
Also Off-Topic: The OTSRs on i305 are a product of Intamin's train designs at the time. There are no extant laws or guidelines about whether a ride needs OTSRs over a certain height or because it goes upside down. Restraints are classified by a Class system. I can comment more on it in another thread later on further elaborating if y'all wish.
On-Topic: Coaster be good, coaster move people, coaster be reliable, coaster make b.mac happy. I would be fine with any of the models suggested recently in this thread.
On-On-Topic: Give me a Mack Powersplash. Three birds, one stone. Launched, cheap and effective ride, and can be a reference to Diamond Falls.