Welcome to the forum - nice to hear from another new member from Canada.
Don't know of any breeders in the immediate Toronto Area, but you might want to check out Upper Canada Discus (Bob Garside) in/near Barrie, Ont., who is a reputable breeder/importer of high quality discus, and who will likely have the size of discus you're looking for.
In that regard, I had noticed you were looking for a breeder, and posted 2 inquiries in separate sections of the forum. No need to duplicate your request postings, - SD members will answer your queries, if they can, with just a single post in either the breeders' fry, or I am looking for, sections.
Your intended set-up sounds good - sounds like you've done your homework.
Best of luck to you.