Hi Rob,
you shall also see if you can identify cards from another language than english. Some may be quite valuable, like the Japanese I'm looking for. If English are the average value (blue border being 40% less valuable than black borders, Spanish and Japanese (with a few Italians) are the upper class value. Italians/Finnish/dutch/German are average too, but sometimes less looked for. French is still findable, so I'd rated them a bit lower.
And among the cards's extensions:
The Balrogs are the most lookek for, then Against the minions (due to 9 ultra rares cards), then Lidless Eye and The Wizards .
Less important but still played off course: The white hand, Dark Minions, and less valuable, The Dragons.
And eventually, you may identify some promo cards. Given their language, they may have some real value.
Good luck sorting them and tell us when you'll know more
