I would honestly not call a Giga an "Upgraded Version" of DiamondBack.
And to be honest, an Infinity Coaster like the one at Knotts (or a Single Rail RMC like RailBlazer at CGA), wouldn't hold a candle to the power of seeing a huge coaster like a Giga (like Fury, Levi, or if you look at PortAdventura; Shambhala).
I mean, giga's and hypers are pretty much the same thing. Mostly airtime, maybe some turns, that's it. The only difference is the height.