I kinda stopped reading the books quite some time ago but my favourite Star Trek book of the ones I did read are -
1 - Imzadi
2 - Vendetta
3 - Contamination
4 - The Great Starship Race
5 - (I can't recall the title now but it was Peter David's Q novel that spanned TOS to TNG).
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist