My preferences have less to do with topic and more to do with expertise.

As a frequent peruser and flyer of Amazon books and Kindle, I have to say that most everything being put out right now is basically garbage.

I don't really blame the authors for it, though. I really think that even though a number of them have gotten results none of them of them understand why.

This is probably why I still prefer the older grimoires and to a degree the books being put out with included entity sigils. I don't care about the summoning methods.

Now that I think about it... If someone was to put out a collection of entities with known and rumored connections with beliefs and such I'd buy it. I'm not a fan of any of the current authors putting out books on how to summon and talk to the shemblahblahblah or archangels as I find them worthless. From what I've seen most collections or explanations of enochian are wrong.

A nice lengthy collection of older entities (Egyptian, pagan, Babylonian, Norse, whoever) and their sigils as well as the mentioned fitting in of the beliefs surrounding them would be nice.