All I can say to you, byteknight, is to pick the one you want, and fill in the holes as you see fit.
For me, I hated the FASA dating system from the moment I first got it; it seemed intuitive to me (as a 14-year-old) that TOS was meant for the 2260s. Treks II-IV confirmed that for me, and I abandoned the FASA dating system entirely (rewriting the dates to reflect it).
For me, the Okudachron is an invaluable resource for my Trek games.
Davy Jones
"Frightened? My dear, you are looking at a man who has laughed in the face of death, sneered at doom, and chuckled at catastrophe! I was petrified."
-- The Wizard of Oz