It depends what kinda high you like. For me, i like downers such as benzos (valium, xanax, klonopin, ect.) and opiates or painkillers ( vicodon, codeine, oxycodone, morphine, heroin, ect.). These are my favorite. I usually stick to morphine or heroin. Oxycontin tends to be too expensive more the time and vicodin is nice at first but after awhile i didnt get high unless i ate liek 30 at a time. Also very addictive if you use everyday for a year or so. Opiates give you a very Euphoric feeling, like you could do anything. Best high by far. Benzo's make you feel drunk in a way and euphoric at the same time. It tends to make you forget alot and feel drunk in a non drinking kinda way. Be careful if mixed with alcohol. DO NOT MIX OPIATES, BENZOS, AND ALCOHOL UNLESS YOU KNOW YOUR BODY, WHERE YOU STILL DONT WANT TO SO THIS.
Some people like to trip, so they dabble with hallucinogens (shrooms, acid, dmt ect.) I usually like to do these when im with friends. More of an outside drug, fun to trip in woods or wooded area. Lights and music are 100 times better.
Some people are into uppers ( Cocaine, Methamphetamine, Ecstasy, Crystal Meth, Crack, ect. ). Im not a big fan of stimulants unless I have benzos or opiates, as the comedown for cocaine, crack, and meth make you feel like crap, and often makes your jaw hurt and give you headaches. I havnt really dont cocaine in awhile. Coke is expensive and the high is short, but I love the taste of the drainage you get when you sniff it. Crack is a better high than cocaine, and very expensive. If you want something that will last alot longer and is cheaper and with more euphoria, Meth is the way to go. Make sure you dont do all the time, since it is very addictive. Crystal Meth is a better high than speed, with a high kind of like ecstasy and speed mixed. Ecstasy makes you feel very energetic and very euphoric at the same time. All music and lights become intensified by over 1000 times and everything around you is great and makes you love everything.