Buying tires on ebay...yikes. look, I understand I'm not in your position, but tires are something you simply can't skimp on. There are only 4 points where your car touches the ground...you have to have good tires.
My recommendation, either grab a pair of rear pilots to match your fronts and leave the fronts on. I cant imagine it would be terribly overpriced if you did tire rack or similar. Or, look at sumitumo zIIIs. That's what I have on mine. They were about as cheap as your ebay tires and a lot of guys like them. They also wear better than the pilots (rating wise).
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