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I would suggest an LE5 N/A to start and boost it later. That way you have the best ECU in a GM vehicle (E67) and should you decide to boost you have a great starting platform. You can either purchase EFIlive or find a tuner shop that has it to remove the VATS and other module interfaces.
You will have to excuse me but what does VATS stand for and what exactly do you mean by removing module interfaces. I am assuming it has to do with CEL codes an things that I won't need in my car that are used by a Solstice. I have never modified an EFI engine so I am not familiar with all that is involved.
Holt