OK I skipped to the end and didn't read the thread - sue me.
Basicaly, my experiences, fleeting as they are, have been with heroin and crack. Crack is far to expensive and a bit like pushing the "I rule the world" button for five minutes, followed by craving for an hour. I haven't tried it since. Heroin - I suppose it's ok once you get past the vomiting stage - but I had this weird feeling that I would only start liking it once I got addicted. To me it's like fags with added euphoria.
Both drugs I have personaly seen ruin lives and turn some of my best friends against me: I would say don't do it. By the way you mention that you want harder drugs - well why not try some: LSD, DMT, 2cb, 2ce, cocaine, mushrooms, ketamine, speed - the list is almost endless. By the way, and this is just my view, but you will get much more out of trips than you will from thinks like smack, crack, cocaine or meth. I'm just saying, give it a go - you might discover something interesting.