Silverfish,
Good luck in your search. It may take awhile, but once you find the right one you'll realize it has been worth the time and effort.
An instructor at my LDS has a tub filled with masks/snorkels of most models that are for sale at his dive shop, plus a bunch he's collected over the years from 'left behinds' on dive trips, etc. He brings the tub to his pool and OW sessions and invites everyone to try them all until they find one they like that fits. If it works in the water with a regulator/snorkel in the diver's mouth, he usually gets a sale and happy diver, a good combination.
Here's another anti-leak tip to add to the many good ones you've already received. Make sure there's no suntan lotion, sun block, or oil on your skin where the mask skirt makes contact. The oils, lotions, etc., can prevent a seal and leakage will occur.
Also, if possible, have a regulator or snorkel in your mouth when fitting the mask. The shape of your face will change, especially when the mouthpiece is moved around.
Educational Media is a fancy umbrella title used by my college for any medium used in teaching; i.e, TV, radio, audio and video tapes, overheads, computers, newspapers, textbooks, etc. I administer the college's distance education program which uses all of the above in one form or another. In actuality, I'm semi-retired and this is a fun thing to be doing when I'm not diving...
Warren