Have you looked into Infinit Nutrition? You can make your own custom blend. They have a questionaire and a slider system that makes it pretty easy to come close on the first try. You can decide your carb blend: fast vs slow burning, and whether or not you want protein and how much. You can also tailor the strength of the flavors. I've been using it for about 2 years now. I used to use Hammer Perpetuem, but after a while I just couldn't stand the flavor and it didn't sit well on my stomach.