The whole Jedi Consular/ Shadow/Sentinel/Guardian concept is something contrived for SWTOR (perhaps as far back as KOTOR), so you won't see any of the novels deal with jedi defined in such clear roles. I guess the novels that tie in with the game however do have characters that clearly have such a role, so I would suggest reading those (Fatal Alliance perhaps?).
As for the whole best SW books discussion:
Thrawn Trilogy for all the reasons already mentioned
Darth Plagueis
Darth Bane: Path of Destruction
NJO series
X-Wing Series
Jedi Academy Trilogy
Correlia Trilogy (yes I liked it, I'm surprised nobody else has mentioned it yet)
Haven't read all the books yet, although I am collecting them all (last count was 130). Ever since SWTOR came out I'm completely back into Star Wars again, and next week I'm starting the massive task of (re-)reading through my collection. Hope to finish it in 3 years or so, and I want to read some other stuff in between (Terry Pratchett novels and ASOIAF for the 3rd time ).