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Best form of Choline is Phosphatidyl-Choline and/or Lecithin (provided you are sure it is not rancid).
Piracetam is certainly helpful, as are some of its variants. You may find you have trouble with muscle tension with the original. I would suggest doing a search on forum - particularly for any posts by tacitus or MHarris.
qhi.co.uk is one source, but I understand you can buy in bulk at much cheaper prices from various sources.
the FDA has issued warning notices that sellers of pieracetam and oxiracetam (based in the USA) must discontinue those products or risk enforcement action. Looks like a pharma industry play to corner the market on mental performance boosters…
If true, not surprising AT ALL. 
Now I want it even more. 