Kashy fins are probably considered the best fins, but because the demand for them is high, so is the waiting time: http://www.kashyfins.com/assets/K_Se..._Brief_4_0.pdf
F4 fins are also quite good, and have lower prices and quicker delivery times. The Big Boy (BB) model is very good for the HWR - I like the soft 70 BB. For really light wind you may want a 70 that has been cut down from the tip, like a 74-4, and maybe an even softer fin. But since you mention 10-11m sail sizes, you may want to go to a slightly shorter fin like a 67-68. The guys at F4 can help you out with particular size and stiffness based on your needs.
F4 fins is located in SF Bay and will have no problem getting a fin to you in Toronto.