It was a good four years ago that i tried Huperzine-A, and yes i did like it although my memory is a bit shady. Very cerebral, much what i would imagine piracetam would be like, if you can secure a cheap source, i say go for it. I don't remember having any negative side effects really, other than feeling more in my mind and a slight dulling of emotions.
If it wasn't for the tolerance of phenibut, I might be tempted to introduce it as a regular thing for myself, but yes, that sluggish sick feeling, and the aftermath of my brain being a bit grumpy because its gaba receptors aren't being stimulated from the phen.
I take it green tea has a less than optimal l-theanine/caffeine ratio?
That sounds like an excellent deal regarding the piracetam/choline mixture. Might I ask what regimen you are on in regards to all nootropics?