I'm looking at purchasing some new tires and can't decide between the Goodyear Eagle UltraPlus and the Bridgestone Ponteza RE730 tires. I currently have the discontinued Goodyear Eagles - Z rated and like them well enough, but the Pontezas have been rated higher on tirerack.com. I'd appreciate any opinions about the tires. Also, how important is it that I replace the front and back tires at the same time? Does anyone know of other good tire websites for prices/information?