Personally, I would use 1.4% as the house edge, since that is the HE of pass line in craps. I think that 1% has to much volatility, and since you can't do better than 1.4% at a casino, just start there.
with game theoretical optimal approach there are several casinos where black jack has a house advantage of only 0.17 %
http://en.wikipedia.org/wiki/Blackjack#Rule_variations_and_their_consequences_for_the_house_edgeOf course not many real casinos (if any) offer single deck black jack anymore. I guess the standard is six decks at least where I live.
Nevertheless the true house advantage may be a bit higher due to other additional rules (rules for the situation when dealer hits a 17 ...)