Bought an f2p pk account from K A L A. Reasonably priced, fast and reliable delivery, everything was as advertised. Definitely coming back for more accounts in the future -- BIG VOUCH!
If you find those interesting I'd recommend looking into Steven Pinker & Sam Harris as well. There's a plethora of content on the subject that they've gone over and Sam tends to have a way of putting thing into a unique and very clearly perspective.
As far as the topic of this thread is...