I had no idea I was casually chating with big names of the Star Trek Literature! I agree with you Relayer1, this is pretty uncommon...
I checked Christopher & Greg's bibliographies; they're quite impressive indeed
I'll be following those advices all the more trustily, actually I just ordered a half dozen TOS books, among which 'The weight of worlds' - I'll soon see if I side with you about Greg being a VERY good author ;> (kidding)
In any case, thanks everybody for the advices and precise explanations!
Universe here I come *dramatic music playing*