(95% of the time for me anyway), I don't want to have to deal with lag. I would rather use a little NOS to give me the ultimate top end HP and have less lag down low. With big turbos, you'd use NOS on the low end to spool and have turbos only for the top end. Seems like it's more efficient to run things the other way around (turbos down low, NOS up top). I'm still debating the same issue you are, though. Just food for thought.