..what do you use and why? What's your favorite? Where do you buy? I'll start off:
I usually go with Gaspari, Muscle Milk or ON for protein powder. For pre workout I usually go with VPX NO Shotgun or Jack3d. Thinking of switching to MusclePharm but haven't tried their stuff yet, they seem to have quite good reviews. I also go with ON Optimen for my multi-vitamin. I purchase 99% of my stuff thru bodybuilding.com.