Heroin or Oxymorphone..and I don't want to get down on the hydromorphone vs oxymorphone... I was one of those 'classy drug addicts.' I only insufflated, and I always bitched about hydromorphone, but I was told after the fact that I'd need a ton to get off that way, and should bang to get desired feeling without throwing away money.
maybe Buprenorphine, but it's been a long time since I had it without having years of its partial agonist bullshit stuck in my brain before use. I somewhat remember that glory though.
Definitely Buprenorphine and Alprazolam railed as one. That thought is why it is a battle staying sober for longer than 6months.