S12s and NRL being the most important, followed by AFL.

What bookies do you consistently find the best lines at? What bookies have high betting limits?

From what I can tell Centrebet have decent limits for union, with 3k+ being placed.

Does anyone know Canbets limits?

Pinnacle is now offering very good lines and have 1.5k max bets. Offer 1.5k limits for NRL but don't know how their lines compare to the others.

SportsTab is horrible. Betting at 1.85? No thanks. I'd prefer to bet at the 1.95 pinnacle has.

SG has a few bookies on their odds comparison, Bet365 (forget them, they'll restrict your bets to betting peanuts).
Superodds, could use them. Lines are decent. Totalbet also comes up with some decent lines every now and then. Don't know about betting limits.