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I agree: you aren't going to get a great 82mm CPL filter for $100. If you had a cheap lens, I wouldn't be concerned, but when you spend serious money on a lens, it's no time to cheap out on filters. I see the same thing with .22 LR competition rifles -- shooters spend nearly $3000 for the rifle and scope, then want to shoot Walmart .22 ammo! Crazy.
I like the Hoya Pro 1 and HD series. I also have a B+W Kasseman Wide (thin, sealed CPL) same as Jim C. mentioned, but 82mm, and love it, but it is pricier than the Hoyas.