Rego chocolate isn't great. Had better luck with the Strawberry. I rate the SIS. As an alternative play around with the High 5 Vanilla Protein recovery - mix with skimmed milk and put in fresh banana and/or strawberries to make a smoothy. Lovely.
Met-Rx was always popular back when I was a lad. Something to do with the efficacy of assimilation/biological value. Its got 20 or so grams of carbs and added doo dahs that you might want to check out though.