Primaforce has been working great for me. I even have another 500g tub on the way.
It even comes with a scooper that fits exactly 1 gram - which is quite useful. It is quite foul tasting, so I find the best way to consume it is to dissolve the amount (no more than 2g at a time) in like 5-10ml of orange juice (and stirring for a few seconds) and get it down in one gulp, and then washing the small residual/undissolved amount out of the cup with some more OJ and drinking that.
Remember, it is best to dissolve it in the smallest amount of liquid possible, as it's quite easy to get down one gulp, no matter how bad it is.