I don't get it... What's the most you can possibly save by buying a pair of lower tier tires...? When I bought mine which were a similar size to the OP (P235/55/19), the Coopers were about $160 each and the cheapo Chinese ones were about $120. So I guess $80 is money in your pocket, but here's the rub-- unless the car is getting repo'd, that $80 will pay for itself a few times over simply by having good matched tires on a trade-in or private sale vehicle.
If I'm buying a used car and I see mismatched or low quality tires, the first thing that pops in my mind is cheapskate that probably skimps on more than just the tires. Now there's nothing inherently wrong with being frugal and buying budget brands (including tires), but mismatched tires throws up a red flag that says "does things the cheapest way possible." Then I'll have to buy new tires to correct the mismatch, so right away I'm asking for money off the price for that reason alone. In the case of a trade-in, I'm sure a dealer is doing some math in their head, because they probably don't want to sell a car with mismatched tires, and if they do, surely it impacts resale value in some way.
Of the ones linked to above, I believe the Hercules is a closer match. The center tread on the Eldorado does not match at all; has much more aggressive siping and/or smaller tread blocks.