Yeah, a good, balanced diet of clean foods is probably the BEST thing anyone can do. Once you have that spot on, there's not too many supplements that are going to give you serious gains.
If you have problems sleeping soundly, ZMA's a good one to take at night/bedtime, and it does help support the body's natural testosterone production. Just don't take it with milk or anything heavy in calcium, including an hour before, and about 30 mins after. calcium screws with zinc absorption.
There used to be several good pro-hormone's out there, but the FDA cracked down on that after the MLB steroid scandal, and the 'ephedra induced deaths' of a few obese athletes with cholesterol levels higher than I can count
Really about the only stuff that works great is, well, androgenic anabolic steroids...the illegal stuff. Since they wiped the legal pro-hormones from the market, more people are cycling gear than ever. I would stay clear of it though. No need to try em until A: you're older, mid 30's for example, and B: you've reached your natural peak physical shape. Most people who try AAS early, like late teenage years, find that (aside from typical side effects) they never feel right when they train naturally. They have poor gains, no focus...and thus they cycle back on again.
Alright, I'm way off topic (as usual). STick to good diet, creatine if you like, and supp's that ensure good vitamin/mineral levels, as well as fiber intake and Essential Fatty Acids. You'd be amazed at what a well-fueled human body is capable of.