i use this stuff called Micell Edge RTD 50. Stuff tastes awesome to me and the best thing is i dont have to mix. only 8grams of carbs (3 are sugar). i get fairly cheap, $20 for a case of 12. i have one every night b4 bed.
i typically mix 1 scoop of whey with 8oz and 1 scoop of casein with 12..the 12 is necessary for the ON as it really is kinda nasty with 8, at least in my opinion