Dextrose and maltodextrin are ideal for post-workout carbs. I don't recommend going with actual whole foods because mechanical breakdown will retard insulin response. If you do not have access to bulk dextrose, however, (keep an open mind, here) choke down some SweetTarts as your post-workout carb source! I know it sounds crazy, but for some reason, the company that makes SweetTarts decided to use no sucrose or HFCS. They are sweetened entirely with dextrose, and I think they have a trace of maltodextrin. Those are the only macronutrients in them! I know it sounds a bit weird, but you can get about 50g of dextrose for $0.33 (the price of one roll) using the "SweetTart Method."
It is even more economical, still, to order dextrose from proteinfactory.com @ $2.50 for 454g. If you can pull it off (I've done this before), you can order bulk dextrose in 50# bags from confectioner companies. I don't remember the address, but search for "International Molasses." That is the company I used last time. I got 50# of dextrose for less than $30.00. Not bad.
If you are one of those crazy purists, and you abhor using anything in your diet other than organic, whole foods, I guess you could use white rice as a post-workout carb source. It ranks pretty high on the GI and II scales.
Hope this helps.
Coe