Chris, how about a compromise? Create a pleasant but smallish "Fort Knox" enclosure where the dogs can be outside without super close supervision ('tho I'm not a fan of B's being outside at all if their owners aren't home) Then go ahead and fence the rest in an affordable, climb-proof material for those times that you're able to keep a close eye on them. This approach works for some folks, depending on the size of the property and wildlife present, and how committed they are to keeping their dogs safe.
Keep in mind, 'tho, the fence isn't just for the dogs–depending on your property, you might want to securely fence a yard so you can enjoy yourselves on summer evenings without a skunk, racoon or bear sneaking up on you 🙂