The tire sizes you have are really optimal, but you could do slightly wider (and taller), to maintain the correct ratio front to rear, 235/45-17 front, 255/45-17 rear... I wouldn't go any bigger... Also, 255/45-17 isn't the most popular tire size ..
-cody: maintenance forum moderator
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2001 Lexus IS300 - 650whp/610wtq (Virtual Dyno)PTE 6765/Custom AEM EMS - Auburn Sky Pearl (1 of 1348)
1999 Isuzu VehiCross 285/75-16 Destination MT's - Astral Silver Metallic (1 of 1021)