Jeez, you'd think an ex-president would know you don't bump your own thread! Have patience, & continue reading on erowid or one of the numerous other drugs info sites while you await replies here. Bumping ones own thread is considered impolite, like tugging constantly at your mums skirt coz you want ice-cream.
Also, no-one here will tell you which one to buy & it's not something you should ask. What if I say, yeah yeah go by the proscaline & then the vendor sells you something toxic by accident, or you take too much & OD. How do you think I am going to feel about that? I'd feel like it was MY fault.
On the subject at hand. I have only tried escaline at threshold doses a few years ago, I got a tiny sample & never got a chance to work up from there. I have an unfinished TR around someplace. I can't remember my dose but it was threshold, pretty pleasant, not too unlike 2c-t-2, which is also modelled on the mescaline molecule. I've never had mescaline itself nor any of the other mescaline-like derivatives so I'm not best placed to compare them.
Suffice to say that I'm sure if you did enough reading you'd narrow it down a bit & find out which one is most likely to satisfy your requirements. Now crack on with that research, reports on erowid are many, I'm sure you can amuse yourself until some more experienced folk find time to comment!