Vote from me for Activate Extreme, I would also add Lean Extreme as well, I totally loved that stack, no pct need with this stack. Search for info on it, good stuff!! Muscle milk has got it's place, but it may not be the best choice for a "Lean bulk", but that's my opinion. I would opt for something that didn't have the fat content, even though the fat it has is in the form of MCT's. Then again, if you can spare the calories, no biggie. The cool thing about the AE/LE stack was that after I quit it, the gains lasted and the effects tapered of gradually after going into the second week of being off it. It also took about 2 weeks for it to kick in, but I was dosing 2x2 AE and only 1x2 LE, so there's room to work with there. Any questions, lemme know!! Good luck!!