Originally Posted by tsloop
I'd go with Optiumum Nutrition's double chocolate protein powder, if you mix it with milk it tastes just like chocolate milk, it's great, I can't even count how many tubs I've gone through.
ON Chocolate is my favorite as well. I also like ON cookies and cream mixed with ground oats.
Though, if you really want to bulk up, you don't just need more protein (actually, ingesting extroardinary amounts of protein can be dangerous and cause renal failure, stick to 1.5 grams per pound of bodyweight at the maximum), you need more of all the macronutrients. You basically need to keep the same percentage of macronutrients (for example, 20% of calories from fat, 40% from protein, 40% from carbs) but with increased calories (a good rule of thumb to bulk up is bodywieght multiplied by 15 plus 500).
Also, eat a lot of meat (pork, beef, venison, buffalo, etc.). Tuna and poultry are good for extra protein, but they're not that good for bulking because they are not very calorie dense. A lot of those calories are from saturated fat, but saturated fat can be good for you if you need to bulk up because it's calories and saturated fat has been shown to increase testosterone levels.