You would definitely want to stay away from waxy maize then. Waxy maize is a high molecular weight carbohydrate that will rapidly spike blood glucose levels.
A good quality whey isolate on the other hand will only contain trace amounts of carbohydrates and not effect blood sugar levels.
For a whey protein - you want to see nothing but that in the ingredients list. Whey protein, natural flavours, a natural calorie free sweetener like stevia and then maybe some salt, soy lechitin and cocoa powder. There are a lot of good products on the market. I personally use isolation from n2bm.com. A good whey isolate should be pretty much fat and carb free. Isolation has 26g protein, 1g carb, 0g fat per 30g scoop.