I have never tried puffed rice personally. What is wrong with grabbing some fruit? It would not only have simple sugars but also nutrients and fiber.
I also agree with Derpamix on the carb range. 150-200g of carbs sounds good. I am 5'10 160-165 and I normally get that exact range of carbs on a normal range. I used to run a lot like you (during my CW days), now I just do a lot of walking/hiking, one day of sprints, and 3 days of lifting.
"If man made it, don't eat it" - Jack Lallane
People say I am on a "crazy" diet. What is so crazy about eating veggies, fruits, seafood and organ meats? Just because I don't eat whole wheat and processed food doesn't make my diet "crazy". Maybe everyone else with a SAD are the "crazy" ones for putting that junk in their system.