Thinking of PWO carbs, I can't bring myself to believe dextrose is the answer. I mean, long term it can't be good having 60g+ of sugar 4 times a week.
This looks interesting - http://www.myprotein.com/uk/products/vitargo_pure
Dextrose IS the answer.
If you want to take to the next level have your 60g of sugar in a 50:50 ration of dextrose and maltodextrin.
Anything else is just over hyped glorified corn flour. you need a fast absorbing carb, so whatever you replace it with it will still have the same potential "negative" effects
Long term it's not that bad considering you deliberately give yourself an insulin spike at the right time for a desired effect.
60+grams of sugar can be find in any 0.5L soda - the average person has that (and often much more) daily anyway.