I really enjoyed the vidZ...
I do understand what you are saying as far as how much power is being put to the tires in first with 3.27 vs 4.10s. The rwhp or torq doesn't change as you already know, but the amount of time it takes to get to the true powerband of your car will decrease dramatically. If you read this thread you may have heard some people talking about changing gears half way through an intersection with 4.10s and changing gears later with their 3.27 or current set up. That is the best explanation that I could come up with as far as answering your question. I am sure there is a formula with the exact munbers you are looking for, but the amount of people with that knowledge or understanding of the mechanics I feel is few and far between.
Personally I have read a good many articles of guys with monster cars moving down in the gear number, say from 4.10s to 3.55s in order to keep the car a daily driver, so from my view, and experience I would tell you to get 3.73 gears with a supercharger. Yes, we all want to be fast, but keeping it in perspective is good advise with the current gas prices. The extra 2-3 mpg you get with 3.73 may be just enough to keep your car a daily driver for alot longer for those of us with that dreaded thing called a budget.