I've only tried Darvocet once, but I liked it a lot. I did way too much -- 1.5 grams worth, in time-release capsules (Depranacol). It took a long time to kick in, and the high was VERY spacy, but pretty fun!
One good friend of mine is a little pill junkie, she recently got switched to Darvocet, and says she likes it better than Vicodin (which she'd been on for years). So give it a whirl... I would just keep upping your dose until you're as high as you want or the side effects become bothersome.
-Zorn