seems like amphetamines would cause that sensation you are describing (amped before the concert).
i had plenty of euphoria from 2c-e (top 5), though my favorite new chems fall in the tryptamine category...
in particular, the 4-hydroxylated and 4-acetylated tryptamines:
4-ho-mipt, 4-aco-mipt, 4-ho-dmt, etc
most would probably argue mdma has the most euphoria though. i agree that i was most happy on that. hard to come by, make sure you test it before you take it. ive encountered numerous parties and pills and it was all just bunk mdma. i dont understand how people can keep eating garbage and think it really is mdma.
id stay away from opiates and especially benzos. the euphoria from them dissipates very quickly, tolerance builds, and eventually it becomes either hard or impossible to function in society without them.
good luck on your mission, take care, and moderate no matter what the chemical.