listen it's your lucky day - check out betfair.com. based in London - i've had an account with them 3 years and never had a problem and if its reduced vig you're looking for it can be less than 1% at times but try to bet about 5-10 minutes before the start of the game - i reckon thats when the vig is at its lowest for US sports.
You are correct sir...BETFAIR is a great place for low vig. They take a tremendous amount of action. A book that is not talked enough about here at the RX. VERY UNDERRATED!
from the posters name "Canadian Underdawg" i thought there is a "fair" chance the guy lives in Canada and Betfair takes canadian customers and is way better than any of the ones you've listed