What are the different kinds of ecstasy?

My best friend and I were offered some triple stacks and we were wondering:
What are the different bases
What are the different kinds of experiences for each
How many/much should you take for a first time experience
and what is the best environment for taking ex?

Please don't give answers consisting of only comments on how bad it is for you, we've already been reading all about the negative effects.

: http://alcoholdrugstreatment.info/what-are-the-different-kinds-of-ecstasy