The reason I believe that many legal drugs don't produce a great experience is because many of them need to be prepared in a specific way. Not to mention that legal highs are generally very physically taxing.
1. Kratom takes first place if you don't count pods. The 15x extract will give you a stimulating opiate buzz if you don't have much of a opiate tolerance. I have been working on a tincture following a guide you can buy at kratomtincture.com. Very good guide, I recommend it to anyone wanting to either a) get a strong kratom product without paying through the nose or b) wants to touch his toes into a little chemistry. I was shocked at how smart and detalied, yet intuitive, the guide was. Kudos to those who created it. That said, I have a kratom tincture that, with a couple droppers under the tongue, provides a very sedating/analgesic feeling. You can also customize your tincture to be more stimulating, or to be balanced.
2. I dig caffeine a lot. Haven't been drinknig much lately due to throat pain, but it's a pretty dam good stim. for being legal. You can tell how strong it is by how fast your ass is in the john after you drink a nicely pulled doubleshot of espresso.
I don't really know how I'd rank the rest, but Benadryl is a decent way to relax before bed in the absence of a benzo...
Amanitas are pretty cool, but to take the amount necessary to get a decent trip is a little more than I can handle... considering the shit smells and tastes like a fuckin foot. Maybe I'll look into making a tincture with it... hmm. Does cause some wacky constipation.
HBW seeds will make you trip but in my opinion it's scary as fuck. It gave me a rash all over my body thought I was gonna have to check myself in to the ER.. I was withdrawing from strattera at the time too though.. so don't go by my opinion on this one.
Anyways, haven't tried salvia, I've heard it's pretty cool. I'm not much of a psychadelic guy though.
Peace!