I think Beverly is one of the best supplement lines around, but very very expensive.
I use the protein powder for contest prep b/c it is very clean and it tastes really good.
I also use the Power Paks but damn, that's a shitload of vitamins, and it upsets my stomach.
A few of my friends swear by the glutamine and BCAAs, but I usually go for the cheaper brands, as I am not sure how much of a difference there actually is.
I've heard that their "Lean Out" fatburner is also very good, but I have not tried it.