Coconut or Almond but I prefer coconut milk - the fat contains approx. 60% M.C.F.A.s which are more easily burned for energy.
Try half of either the above and half your regular milk to get used to the flavor switch.
While skim milk does save calories, scientists at the U. of TX found that drinking whole milk after lifting weights boosted muscle protein synthesis 2.8 times more than skim which lacks the heart-healthy omega 3 fatty acids (which makes skim milk a highly processed, additive-laden, vitamin-laced beverage that – oh, yeah – has protein). Take out the fat from milk & all you really have left is sugar.
That being said, Flavor Splurge because I've been a good girl - Horizon's 2% or put me on the Chocolate team, mmm.