When building a new class based on another am I stuck with the previous class's choice of powers? For example if the class has 'Priest 1' and chose to take the Inspire power then can I choose another power for the new class of will all classes along this "lineage" be stuck with Inspire?
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When you select the trait is when you decide to choose the Power. So yes they would transfer over.
While you cannot have the same trait twice, you can always replace a trait with another, even if it's the same trait with a different option. However, this must be one of your newly selected class traits.
Pg 28 under class traits, on replacing traits.
What Domain? Reptilia?
Humanoid in this case.